Too early to say surely. Buananotte , Baleba, Igor ( not like for lkie replacements anyway- Is Gilmour a replacement ? ) are hardly players that should be written off - Buonanotte is a full Argentinian international now and has definitely improved this season. But he's only 19. Likewise Baleba...
It was first reported, i think , by The Athletic in Feburary. Barber has confirmed it (although no details yet) in a podcast he did with the club earlier this week.
https://theathletic.com/live-blogs/premier-league-news-latest-live-updates/2OlSBRbiBRgd/ije1jRNGmd84/...
So trying to track down if Mitoma actually said this or well anything related to this story is pretty much impossible.
I don't think its a twitter account anyway and the The source referenced is your usual "reports say"...