A vulnerability is a back door. The only problem I have with that statement is it's exclusion of open-source software. It's got more back doors embedded in it than closed-source software.

Jimmy: a short crowbar used by a burglar to force open a window or door.

He didn't necessarily say it was collusion but I suppose it's fair to clarify. It seems narrow to suggest it's just a stash of 0-days. I suspect they've been heavily yet covertly involved in the popular software tool-chains and computing hardware.