Indeed, both of these terminals were part of a Cambrian explosion of glass TTYs.
I mentioned the VT100 specifically as that was what the comment referred to. Also because for some reason it somehow became iconic, though I don't know why (I always thought the VT52 superior, though the best IMHO was the Ann Arbor Ambassador).
Don't forget the 1500 came out before the VT100.
Your comment is a reminder of how dominant DEC was at the time, the Apple to IBM's Microsoft.