E-sports is a business. This may come as a shock to a lot of people but competitive gaming is no longer 50 man LANs in the college auditorium on a Saturday evening. Serious prize money is involved, sponsorships, the tax man, etc. As a team manager at Fnatic, it makes complete and total sense to replace Era right before a major tournament like TI4 if he didn't look stable, whether in terms of in-game performance or out-of-game behaviour. That's what any manager in any other sport would do. Could they have gone it about it better? Sure. But the idea, of replacing Era, is entirely rooted in logic.
Well I think they were trying to drum up sympathy/support.