That particular derelict bounty is actually trivial once you know the trick:
Good point, that's one way to deal with bounties. On a regular bounty like, say, with a dozen Conquests or Atlas mk2, I may leave one (non-flagship) capital escape and consider job done. Get the reward, pack the loot, all good.
On the other hand the way I deal with derelicts and remnants is
no prisoner 100% destruction and/or careful disconnect of all AIs from any energy sources and communication devices (you never know with these things!). Because higher chance of rare/precious loot... and more importantly specifically looking to complete a challenge.
Also I thought this one was more interesting than the lone Guardian ship I used to encounter in the previous version of the game. Lone Guardian can be flanked. Several Guardians with large supporting fleet of tough ships is another story. Maybe this was already in previous version and I skipped it.
(later this week I'll ask my contact and see if the bounty shown in first post now pops up)