I also think KD's burner account is real. We all kind of know how he is on social media. There's a pretty good chance he actually said those things. But I don't think it'll be a big issue. KD is already at the end of his career and the Rockets with their ups and downs don't really look like a serious title contender anyway.
Durant was a basketball player I liked, I was even excited that he would be playing alongside Alperen Şengün. I thought they made a good duo, especially at the beginning of the season, they got along very well.
After seeing what KD wrote, I started to lose my sympathy for him. There are some points where he's right, but generally, a player shouldn't say things like that against his team.
I think he's currently disrupting the team's dynamics, and a good trade could bring in someone much more beneficial to the team. I highly doubt he'll stay with the Rockets at the end of the season