This is so incredibly wrong. Firstly equating Van Gaal and Ajax football is itself impossible when Van Gaal football differs quite heavily from Cruijff football in everything but formation. Secondly, Van Gaal in his later years is very different to Van Gaal in his earlier years. Thirdly, Ten Hag has definitely brought things to this system that aren't "Ajax" historically.
but please tell me, how is Ten Hag's use of a very attacking narrow 4 with very wide wing-backs similar to Van Gaal's wide outside wingers?
One similarity is the use of Tadic and the use of Kanu/Kluivert as highly technical, strong, centre forwards who act as the target of direct forward passes, and the use of Vd Beek vs the use of Litmanen as the player who runs into that space and operates around him.
Another similarity would be De Jong playing sort of hanging from the left back almost drifting forward/carrying the ball forward and inside the same way Seedorf did in 95. But Van Gaal's team played with a back 3, with De Boer and Reiziger both building up with their passing from around the halfway line. If you want to say that Blind plays like Rijkaard did, or that De Ligt plays like Danny Blind did, then you're again missing De Boer/Reiziger in the system, precisely because they played with them instead of our current wing backs.
but more importantly, Ajax in 95, from what I know /have seen about it defensively dropped back into a compact 4-2-3-1, with Rijkaard dropping back into cb and the centrebacks as fullbacks. Van Gaal has always had a far softer emphasis on pressing + forward-defending / "cover". Also, Van Gaal's system up front was exactly that, a system, whereas Ten Hag's team have a lot of freedom (he's been criticised for being too dependent on individual quality up front quite a few times this season actually)
Ten Hag's press is extremely tight, horizontally, as in we'll have 8 players within like 20-30 metres of the ball, even around the sidelines, leaving the other flank completely open. This isn't something I've seen at Ajax before.
Someone mentioned that Barca game from 2014 (fantastic game btw), but if you look at our (maniacal) pressing in that game, there was far less of that committing the team horizontally:
look at 01:15 for example, they're pressing on the wings but the rest of the team retains its structure.
Today's Ajax plays extremely narrowly. On the ball, the whole team shifts very narrowly to the side of the ball to act as pressing cover if the ball's lost, and similarly in the pressing itself.
this for example isn't quite a fair example, cause it was just following a throw-in, but look at how Ajax is set-up. In these two screenshots you can see the entire XI (minus goalie) on literally a quarter of the pitch's width:
Similarly, on the ball:
(you can just about see the knee of 10th player, De Ligt, at the kick-off spot)
A big thing of Ten Hag's game is the number of players ahead of the ball during build-up, as you can see here (ball is with nr 21, with technically 7 players ahead of him), and another thing is the narrowness and sort of horizontal shifting (see rightback, nr 3 moving inwards here)
which was actually a big thing we struggles with in that second half, because Spurs were consistently finding the massive space on other side, having us sprinting to get across, as in:
anyway, I've lost track of where I was going with this other than that Ten Hag's Ajax does a lot of things I haven't see before. Bosz' Ajax was a modern take on Cruijff, with more intense forward pressing, wide wingers until they got the ball and "inside" fullbacks (both a la guardiola). Ten Hag is maybe more Van Gaal, but is a lot more modern in almost every way than Van Gaal's take, that had watered down so massively by the time he got to United, but with a lot of things that aren't traditionally "Ajax" at all, even if the results themselves do capture the character of football that we always strive for.