"Cracking" is very much the wrong word to use in that article to describe what those modders are doing.
Cracking, as far as video gaming goes, very specifically refers to the act of breaking & removing DRM from a game to enable it to be pirated. Modders do NOT crack games. They MOD games.
These modders are NOT cracking DAI. They are merely experimenting with the game to find a way to allow mods on it. This difficulty has much to do with the fact it's the frostbite engine, which is extremely unwieldly to modify in any shape without the actual dev kit, which only bioware would have (or DICE I suppose).
These modders aren't "Cracking" the game, just to be clear - they're just figuring out how to MOD the game. (On a related note, apparently Chinese crackers have supposedly broken through Denuvo DRM in the past few days which will likely mean DAI will start to get pirated not too far in the future 