Such a click Bait one and you guys are falling for it. Ralph hasn't implemented any style except for shoring the defence. Yes, he has been trying to play more direct by going vertical and quick one touch passing but that's not exactly something which I would consider a style. A style and pattern takes time, definitely more than couple of months.
I disagree that the only thing he did is shoring up the defence. If anything I think our set defence under Ole with McFred was better than what we do now. However the ideas he did implement are very basic tactical building blocks that will work regardless of which modern coach we hire. In my view the big changes are
(a) pressing goal kicks and preventing play from the back. e.g.,
(b) 2-3 rest defence with players occupying various zones
This is pretty basic stuff that doesn't need a lot of tactical intelligence. Do X when Y type of instructions given to every player will do the job. The genius of guys like Guardiola is building this level of spatial awareness into players so basic pressing patterns like the ones we employ don't work. The players obviously don't have a 360 degree field top down field of view like we do but behave as if they do. Some of it is clever hacks (positional play, only one player can occupy a zone on the pitch at a time etc.)
The other issue with that article is that it focuses on overperforming coaches. (given a wage budget, who is hitting above their weight). Either their definition is a bit wonky or their model is broken (probably both) because Ajax have been head and shoulders above every other club in the Dutch league in almost every single stat. If you only consider points, sure Ajax aren't overperforming. But xG, xA, possession, high turn overs, PPDA they all tell a single coherent story. And that story lines up very well with every single top club in their league (Bayern, City, Pep etc.) all have similar stats.
We don't need to discover a whole tactical paradigm to be successful, just implementing / copying the current football "meta" well is good enough.