To be fair, his comment was not directed at another team, but at another body of code. (Two, actually.) The context makes it not merely a dig, but constructive feedback: "Those past projects have significant flaws, and here we have an example of how to do it right." If I were an OpenVPN or IPSec developer, I think I'd swallow my pride and take this valuable opportunity to learn how to improve my work.
Not sure. I'm not on the team, but I seriously doubt their intent was to write bad software. I know before ipsec existed there was nothing, so why not thank the individuals who worked on it for pioneering the effort in the first place?