He didn't call Glass a founder. He implied Glass wrote all the early code and essentially built Twitter, and said he deserves all the credit for that early building out. I really don't have a problem with putting it that way. That's true based on everything I understand about the Twitter backstory (and confirmed by Noah, Ev, Biz, Jason, and Jack himself).
I think he's referring to the article's headline. But that quote resonates with me. I would never serve files from a laptop--who does that?! But it does have battery backup in the event of power failure, LOL! I can see the appeal for getting something working quickly. And you don't have to worry as much about random web host stealing the source. At least in my imagination, Noah's coding style was perfect for getting a prototype working, but had to pass it on to "do it by the book" engineers who no doubt cursed "this spaghetti is all wrong, there's globals everywhere!"
In the old shared hosting days, they knew exactly which scripts were suddenly eating up resources. You might get an email like, "Hey we disabled xyz.php because it was hogging the server." So it's not like they couldn't see who was about to make boatloads of money and then jump on the bandwagon.