All I see in Rossman's video is someone frustrated by a influential person giving a platform to an organisation that, to be frank, has shown themselves to be considerably less trustworthy than GrapheneOS. I believe strcat has been the target of harassment, I believe them because I've seen it happen and given the sensitive nature of GrapheneOS I also think it's not terribly unlikely there was an organized disinfo effort.
That I've seen "This is informative and unfortunate." come up over and over again as if it were some mantra, I guess is sorta telling. People aren't thinking for themselves, they're just uncritically absorbing the opinions of the charming people they're watching on youtube.