Well, Zen tries to build a whole religion around the idea, losing the spirit of simple easily comprehensible advice that can be expressed in a single sentence.

So one answer to “what new” could be “delivering the advice without unnecessary complication”. Although I can’t really tell if the advice above covers the whole of Zen, which is part of the issue.

Zen doesn't have to be a religion, it can be whatever you want it to be.

That literally makes the term meaningless.

Welcome to Zen.