On every single skateboard post or short video, somebody will mention Mullen too.
But anyway, outside of skateboarding, millennials also know of Bam, Sheckler and maybe Dyrdek.
Gen-z probably knows of the YouTubers that show up in their feeds. SkateIQ (Mitchie Brusco), SkateNomad (Mike Boisvert) and probably Andy Anderson because he's everywhere.
I think it's safe to say that skateboarding isn't as mainstream as it used to be when MTV was the main youth cultural feed, but it also allows for a lot more unknown people to rise up. Nobody cares about what young dude Thrasher and the industry wants to portrait as a professional. The skate scene these days basically consists of old men and young women watching footage on YouTube.