Ignore him. He is just mad that Gamecube Nostalgia is what is popular right now with most Nintendo fans.
As for Arlo, I like him. Surely, his opinions and mine clash sometimes, but those are his opinions. If you don't like them, then search for another youtuber that delivers content more suited to your tastes. You are no hero for trashing him. Go spend your time more constructively.
Regarding the video itself, I agree for the most part. As far as main entries go, SwSh is ok at best, mediocre at worst. Perfect comfort food for those like me who want more pokémon in their lives, but nothing more. Years down the line they'll probably only be remembered as the first proper games on console, but that will be it. (Hopefully, gamefreak will be able to take their time to polish the next entries to make them more worthwhile).