Haven't been checking this for 5 years but has something changed or there's still a risk that Discord will ban your account for not using the official client?

That part of the terms of service is still there, although they don't go out of their way to ban people unless they act like bots or whatever. I don't worry too much about Vencord, since all I'm using it for is editing CSS.

Discord could be knobheads about it, but I think they realise there's little point in actually implementing any checks and banning accounts unless said accounts actually cause problems. That section of the terms of service is probably there just as a catch-all just so they have a reason to ban, just so they don't need a good reason.