This list is pretty good overall, but I'm going to point out a few atrocities:
Infernape A+ -> A
When evaluating the other mons in A+, putting Ape in the same tier as them simply doesn't feel representative of how good it actually is in the current metagame. For one, when you opt for other A+ breakers like Latias or Heatran, they naturally make your team stronger defensively vs common threats such as Heatran/Loom and Rachi/Latias, respectively, due to their typing and stats. Infernape on the other hand adds very little utility to a team outside of being a breaker, a job which it simply isn't good enough at to warrant placing it in the A+ tier. Physical sets have the problem of killing themselves with Flare Blitz recoil while special/mixed sets rely on the inaccurate Fire Blast, and often struggle to get important OHKOs. Choiced sets, while powerful, can be very prediction reliant, and often get completely destroyed by teams with multiple Protect users. Not to mention, locking yourself into a STAB move and giving Dragonite/Gyara a free DD or Gengar a free Sub can spell doom for the more offensive builds Ape often finds itself on.
In addition, Ape is INCREDIBLY easy to wear down on a level unlike anything else in A+, and pretty much unlike anything else in the game. It has the unique combination of being vulnerable to every entry hazard, weak to sand, and susceptible to common forms of priority such as Mach Punch from Breloom and Extremespeed from Dragonite/Lucario. Granted, you can run Slack Off or Lefties 4 attacks to mitigate this issue slightly, but in the former case, you'll really be missing that last coverage move while in the latter case, you are genuinely piss weak without any sort of boosting item. Lastly, current metagame trends such as increased Swampert/Latias usage and the influx of Dugtrio hurt Ape, which is ultimately why this inconsistent mon does not deserve to be in A+. Personally, when I teambuild, I always always find myself preferring other options to Ape, and putting it in the same tier as stuff like Starmie, Rotom, and Breloom is simply a joke imo.
Magnezone A- -> A
Imo Magnezone is simply a cut above the rest of the A- tier mons, and the value it adds to a team much more reflects an A tier mon overall. While it goes without saying that Spikes are one of the most centralizing and strongest mechanics in the game, and the ability of Magnezone to simply delete Skarm from the match is what sits at the core of its viability, Magnezone also has a lot of other overlooked good qualities. For one, it has a way to beat almost all of its common checks - Swampert needs to fear HP Grass and/or Toxic/Magnet Rise, Clefable needs to fear Explosion, BoltBeam Clef loses 1v1 to Metal Sound, Latias needs to fear Toxic/Explosion, defensive Rotom needs to fear Metal Sound and/or Refresh, dragons need to fear a potential HP Ice, etc etc. In other words, you can tailor make Magnezone to be able to beat whatever you need it to beat based on the needs of your team, which isn't something I can say about the other A- mons.
Additionally, there are some current meta trends that make Magnezone feel like a more useful pick than ever atm. The main one is that defensive Jirachi with Body Slam is at an all time high, and the ability to at worst reliably cripple it with Twave and at best remove it from the game completely is huge. I will admit that the influx of Dugtrio hurts Zone, but in most cases where your Zone gets trapped by Dug, it's after you've just trapped their Skarm, which is almost always a worthwhile trade for the Zone user. This is especially true since, unlike Dug, trapping something with your Zone doesn't always guarantee a free turn to a dangerous sweeper since Zone isn't always choiced, and even when it is, electric is a very reliable offensive typing that's much harder to set up on than Dug's EQ. Furthermore, in many cases, trapping a steel lets sweepers like OTR Zong and SD Gliscor, which naturally match up excellently vs the 2 best mons in the tier, completely run through teams. Even in games when you're not trapping stuff, Magnezone's typing make it a great switchin to stuff like Latias and BoltBeam Clefable, and as I said electric is a very consistent offensive typing to spam. Overall, I would describe Magnezone as a mon with a guaranteed level of usefulness in all games at its worst, but a large potential for an infinite utility ceiling that allows it to completely dominate certain games at its best.