> WebKit.
> A web browser designed from the ground-up.
Both of these can't be true. Perhaps they're thinking of Ladybird?
WebKit is a rendering engine, not a browser. It's a bit like saying "that isn't original art because you used Earth physics that govern how paint flows and dries.
Can't you build (and design before that) an OS from ground up around Linux?
WebKit is a web engine, not a browser.