That description defies the evidence in that youtube video. Either that's unrepresentative (and you pretty much agreed he does like to get into the final third) or you're not being consistent in your presentation of Longstaff's weaknesses.
Well I went into detail using actual raw data from this season earlier to show his strengths and weaknesses defensively, as someone asked for them. Here are his possession/attacking stats for a midfielder (compared to Everton and Newcastle current midfielders to have played in the League this season)
Goals - 1
Assists - 1
Chances created - 5
Big chance created - 0
Passes/crosses into the box - 16
Passes total - 368
Accuracy - 81.25 (impressive, the best of any Efc or Newcastle midfielder to play over 10 games)
Passes in op half - 186
Passes accuracy in op half - 76.34
Long passes - 52
Successful long passes - 28
Passes into final 3rd - 46
Possessional passes - 374
So, those stats back up what I've said. He takes care of the ball well. But he is in no way creative. He is, in no way, an attacking midfielder and he doesn't play as an attacking midfielder. Howe has him playing in a 5-man, flat midfield, with wingers pushing on either side to represent a bit of a 433 in attack. Benitez doesn't play 433. Maybe he would if Longstaff comes in but, as I've said, it doesn't solve the issue we have which is Allan lacking the positional discipline to play deep and Longstaff also lacking it.
Like I said, I don't think it's a bad signing. It's a middle of the road signing if we make it. But he shouldn't be the priority with whatever money is available right now, because right now he doesn't desperately add what we need.
I do rate his ability to keep hold of the ball and i do rate his ability to press but as we've already discussed today, he gets bypassed easily because Newcastle - like Everton - don't press as a unit, or at least they didn't do under Bruce. They've been a tad better at it under Howe.
But those passing stats when it comes to playing attacking passes into the box or the final 3rd are not at all the numbers of an attacking midfielder. Because he isn't an attacking midfielder.