That's not nice and totally uncalled for. Three years is a very short time.
The original comment did not compare xbps to BSD package managers. What it said was that xbps was written by a former NetBSD developer and thus arguably has different qualities than other Linux package managers. It is a different approach from someone with different sensibilities than a Linux developer. I have read comments from Void Linux mantainers and users that say more or less the same thing.