Yeah, he's full of crap.
But as all of us on here know, you can't be a expert on everything so don't punish yourself
If I remember right, you can (in theory) daisychain 128 devices on each USB port. It was shown off one at the one of the big computer shows quite a few years ago, but I think that's the only time it was done!
Useually it's one device per USB port (and thats why USB hubs are so popular).