You are certainly not wrong, but I think even if you add up all people with multiple personalities + their friends willing to stick with Discord due to Pluralkit, I would be very surprised if you'd be within less than 4 digits after the comma percentage-wise.
I think @Kangie was mostly responding to the clickbaity title of it being Discord's "secret weapon" to keep everyone on the platform when no, it just would not matter. It's like Mastodon and Twitter. The people who really, truly care are already on Mastodon and the rest is where the biggest community is.
Boomer today is used for anything that's old, and I wouldn't be surprised if you get Gen Xers that get called boomers. Since boomer shooters are a homage to old shooters, we call them boomer shooter. The ultimate problem is that it's just catchy, so unless you find a more catchy term, you're shit outta luck.