No. People in the entertainment industry frequently move around for more pay, opportunities or an increase in rank. They also hop around between companies.
There are things that went wrong with this cb for sure. But for NCT, they seem happier and more relaxed and had appearances across many shows and content that I've never seen them in, plus a robust fansign and fan meeting series, so it doesn't feel like it's necessarily a negative that they have new managers, tbh.