I'm talking from experience too. And the platforms are much worse for Ganon and most other characters than most people are letting on. Anyone who thinks otherwise doesn't know how to angle shield and jump out of shield. Although I will add Wario is in fact really overrated on Brinstar for this reason as well, since he frankly benefits less from Brinstar than most Wario mains seem to think. In the majority of situations, if you are getting hit on the platforms in a matchup that is not Metaknight, G&W, Mario, or Luigi, you're doing something wrong, because nobody else in the game has a real aerial platform pressure game that actually covers the basic escape options. Almost the entire cast has to rely on baits and the threat of grounded platform pressure to lock down someone on a platform, which is a VERY IMPORTANT fundamental option lost for everyone on Brinstar.
The lava only increases your survivability against gimps. Honestly when I play against a heavyweight that has low mobility, my goal isn't to gimp them, but to fundamentally rack damage on them extremely safely. Gimps against good players are fairly uncommon, even against most terrible recoveries. And given Ganon's low mobility, he isn't in a position to be avoiding the lava at will like many other characters. Yes GETTING HIT BY THE LAVA IS AN OPTION, but it does mean taking quite a bit of damage, and the small blastzone quite frankly is more detrimental to the survival of a heavyweight than it is for other characters mathematically. Killing someone at 60% with Ganon literally isn't big news, aside from the fact it's Ganon killing you. You know what's a big deal? Mario's B-throw becoming a viable kill move on Brinstar from something like 120-160 instead of like 150-200 on other stages. THAT is extremely huge.
You better be more specific. I am extremely specific when I say that Ganon only should consider CPing Brinstar against the ICs and Falco, who are characters who clearly are hurt more by the stage. A lot of characters do suck on Brinstar to be frank, and this does not exclude Ganon, who really doesn't have anything special to take advantage of the platform placement and also really dislikes the uneven terrain for more reasons than the fact it gets in the way of thunderstorming.
Still loses to waiting. Edgetrapping on the pillars is honestly a really bad idea if you're trying to get a kill, because you're far more likely to stale something useful for kills rather than actually hit with it, especially if your opponent knows how easy it is to time a >100 ledge attack to counter that, which WILL beat your hitlag shenanigans. Also speaking of edgetrapping, it's generally easier for most characters to get around on this stage given the platform placement as well as the option of hitting the lava, both of which you failed to mention.
I pick Brinstar all the time. And not simply for my main tournament characters G&W and Mario. I would argue that I have one of the most competent Falcos on Brinstar given that I actually practiced tons of characters specific shenanigans on Brinstar in general as well as developing an improvised playstyle to handle odd terrain, and I will still maintain that the stage is godawful for him due to how much the terrain and platform placement limits his basic spacing and platform pressure. These are problems that most of the cast, and Ganon especially included are not immune from.