Anyway, while searching for alternatives I came across someone on a forum saying that extracting those stats might be a violation of their EULA. You can extract basic data (because, yeah, I don't think you can copyright a person's name or an age, and that data is avaiable on lots of websites like wikipedia or transfermarkt anyway) but stats belong to Sega/Sports Interactive, they are copyrighted. I guess they are just being more careful now after that problem with Manchester United? But still, you can see the stats in the game, with the help of some tools. It's just much slower.
I have Football Manager 2020 (thank you, Epic Games, for the free games) and I installed it, and with some tool like Genie Scout you can see the stats of the players and manually introduce them on this excel file that converts them to PES stats. Yes, it's much slower, but I believe it works.
What worries me is that if this happened with Football Manager, it could as well happen with PES, and super useful websites like PESMaster could cease to exist or lose much of their functionality.