He has a lot of interesting input and advice due to his extensive first-hand knowledge. Just because he stands behind certain makes and sells them doesn't diminish the worth of his comments. If I decided to open a bike shop and sell Bike Fridays, Bromptons and Citizens, does that mean I can no longer post about their attributes or why I like them?

As for the warning, I've seen a lot of baseless warnings from the moderators of many forums... every Mayberry has their Barney Fife.