I guess he is a star in the UK, in this side of the world, he is just a popular guy, a very popular guy tho, will the people PAY to watch him? not sure, i mean, if he does 500k, but another 1 million PPV star is not easy and fighting no name prelim guys will not cut it for PPV headliner.
Post fight interview of him has more views than the main event combined, Rosas Jr kid has more views than Anklaev, actually Jan has twice the views, i guess being a Dagestani not speaking English hurts his popularity.
Pereira doesnt speak English yet his post fight interview has 1.9m views, Pimblett has 1.4m, UFC 281 Poirier has 800k...Makhachev's UFC 280 interview has 3.7m, way more time equals more views but i thing the big chunk of views comes from the first few days.