That's a link, all right, but it doesn't refute your correspondent here.

Chromium forked Blink from WebKit, which was forked by Apple from KHTML. We have a fork (or spork: https://twitter.com/BrendanEich/status/1687485972164837377). We could cope if Google were to repudiate Chromium (and violate the FOSS licenses on the sources).