Kristian Bezuidenhout (south-african pianist) always says he plays “Klavier”. And he does, I heard him perform KV466 an KV488 both on historical and present-day instruments. He’s actually one of the few pianoforte players (with Badura-Skoda) who doesn’t has the need to bash the modern piano.
Most HIP “artists” are as extreme in their believes as the Taliban.