Yep, they have escaped from the group stage with the help of Amorim. If only in the round of 16, an average team would play with United, they can qualify to the next stage. However, we might be underestimating United, and let it be that they will be victoroius in their matches. United knows this league as the only opportunity for them to qualify for UCL next season and work hard tirelessly to win it.
This have been my taughts all the while I saw that they appeared to have been doing grate at the group stage of the Europa this season and have been making productive results in the group stage of the europa this season, but not to underestimate United, it could be they have the Europa as a priority and so they are doing really good at it so they get just the best off it as it will avail them an opportunity for a whole lot next season. The fact that they aren't doing well at the Premier league isn't a reason to write them off in other league games.