Quick post patch update.
The mission is doable now, everything works perfect as long as you do not mess it up.
However uppon failure, it has very weird behaviour. You get dropped to debriefing, as normal, if you choose try again from debriefing, you will have no control over the chopper, it start up automatically, fly abouve the runway which causes mission failure again, back to debriefing, it looks like it is replaying a recorded attempt (not yours, it is always the same). if you choose end mission, and restart it from the campaign page, everything works fine again.