All the responses here are interesting, but I believe a promotion this early would be for one reason: the talent evaluators on the Wichita staff, and perhaps roving staff as well, have watched and declared that he has nothing left to learn at AA. Stats are almost incidental to this. Other players such as Larnach likewise.
We fans can only guess from the stats, and small sample only begins to explain the problem with that. The evaluators will factor in the quality of the pitching he has seen on a day to day basis, the quality of his swings and the quality of his non-swings (10 walks already tells us something but not enough), and so on. It doesn't really matter that he's faced only two opposing teams, if (and only if) the pitchers he's faced have fed him quality offerings and he's connected against that.
If he's fattened up on get-me-over pitches, or against pitchers whose stuff just isn't good enough in the first place, let him continue to develop where he is. If the evaluators think they have a Juan Soto situation on their hands, they could move him up to AAA tomorrow.