I'd treat such an advertisement not as a signal "there's nobody there capable of doing it" but rather as a signal "we'd like to do this thing, but it's not important enough to divert anyone who's working on stuff that matters to us, so someone new can tackle it".

I wouldn't take any job ad copy as disparaging to the current team.

Neither am I, just in this case I know some context that lead me to this question.

SegWit being pretty much the most important update to Bitcoin so far with a lot of advantages, I would expect that CB would give top priority on supporting it. But Brian when asked about it, he replied with a job ad about new positions, while I would expect they would put their most experienced engineers on it, instead of depend on new recruits for such crucial and maybe challenging project.