"It also has 0 fighters with physical disability, and I believe canonically there's none over the age of 30."

First of all, already proving how little jack-shit they know about a game they have clearly never played with the age statement on a game with the likes of Bayonetta, Palutena and Rosalina, then somehow daring to say none of them are over 30. And second of all… it is a fighting game, dude. Of COURSE they have no disabled characters by default. They are actually doing disabled characters a favor by not putting them on Smash, and unless they get someone like Auron from FF X or Kenshi from Mortal Kombat, who have rather exceptional canon reasons to be disabled and still good at fighting, that will remain to be the case. Hell, they are actually generous by letting characters like Villager and Isabelle be fighting characters despite not being in physical shape to do so in canon.

We have

Southern Europeans like Mario and Luigi
Central Europeans like the Belmonts
Northern/Western Europeans like Peach, and I guess Shulk
Asians with Joker, Ryu, and Ken (Daisy used to count back in the N64 era)
Black people with Villager and Pokémon Trainer
Euro-Americans with Ken (again) and Little Mac
Fantasy ethnicities like the Emblemos and Hero
Any race you want with the Miis, and to a lesser extent WFT (She has the most languages voiced and is the only one with Mexican Spanish)
As well as aliens (some human like), plants, and animals

Not to mention how much of the cast is female, and more characters are on their way, of which sadly none will be Klonoa or Byleth.

Tell the dude behind that video, "Lack of minorities my right foot"