At a guess, he thought you were generalising, which I also though when I read your previous comment
Sounds like you're implying that humble bundles have been doing per tier keys for a whileas a norm, otherwise what difference does it make when NCC-1709 last bought a bundle? Only makes sense in the context that you've implied they've been doing it for a while and NCC-1709 is out of the loop.
Hence the whole "all separate keys on bundles in recent times" response, because the norm does seem to be separate keys for the games. And I can't see anywhere where someone called you a liar.
Classy comment below too.