He makes a fair point. Quantum is just the latest scam to generate hype and raise money from unsophisticated investors or launder money through NGO's, not a real deliverable thing... but...

“It's easier to fool people than to convince them that they have been fooled.” -Twain

Since there's much for scammers to gain in seeding quantum fud narratives, you're fighting an uphill battle trying to educate everyone and defuse the scam narrative.

Better to acknowledge the fear and redirect it from a place of alignment, like narrative Judo or parenting a small child.