I'm not sold on Ansu, especially in current physical condition but that is the most superficial analysis of goalscoring ability.
You could run through Cristiano's career goals and raise similar objections to probably half of them. Can't tell you how many times over the years I've screamed at the tv, all red faced: "RIGHT AT THE KEEPER FUCKING LUCKY EVERYTIME."
Sooner or later I had to face up to the fact that it weren't flukes. I'm not saying that when a poorly placed shot goes in, it's somehow a 4d chess genius move by the finisher. I'm saying that there are other variables to look at, that placement is just one of the parameters of finishing.
This is not FiFA where you just have to point in the direction you want and shoot. There is more to it. In many situations, just getting to the finish and sending it on target with good power is more than 95% of players would be capable of.
That's not to say I think Fati is an elite finisher. But there are clearly some things he does quite well. One of them is to find the shot (creativity, confidence). Another is the composure to hit it (balance, coordination). A third is getting good power directed at the goal (technique; he's got a fine, reliable instep and a laces that's more powerful with flashes of knuckleball.)