You shouldn't let it get to your because it's a small matter. Some people will act on and perpetuate false information. Some people will find out for themselves.
I'd suggest leaving yourself open to the possibility that they may have a stiffer ride. You don't have to act on the possibility, or adopt this as the absolute truth. You can still act on, and pass along your own opinion that they make no difference. Any audience has access to the same pool of information and expert advice, so nothing's handcuffing them to adopt your opinion or wheelbuilder.com's opinion.
Instead, you can keep in mind what you have in common. Both believe in the value of hand built wheels.
These days, that's getting to be rarer and rarer.