Be my guest.
I'm an American engineer who has forged a few blades and used many. It doesn't make me an expert but it has taught me how to choose the right material for the intended use of the tool.
While you're telling him, you might ask why the exclusive venue of 420HC is the under-$30 small blade market.
Also, feel free to Google "gerber knife recall". I think they're up 6 in the past thee years now?