I can't say Man U played better than Newcastle, but I guess the home field factor played a major role... They were lucky in this match and to be honest their game was much better than the previous ones... Now Newcastle and Devils have the same number of points in the standings and there is a small chance to get into the Conference League if Chelsea lose to Bournemouth, which I doubt...
Manchester United have not been able to show good performance in this season and they have failed to perform average that's why they are at the bottom of the points table. Of course we always expect better performances from United but Manchester United have let us down this season.
Manchester United's performance in last season was a little bit better due to which they got a chance to qualify for the Champions League this season but they have no such chance in the next season as they are now in a very bad position in the points table. Manchester United and Newcastle have played 37 matches each so far and after 37 matches they are tied at seventh and eighth position in the points table with equal number of points. If two teams perform exceptionally in the last match, the points table may change between these two teams.