Larian: "We started with what was basically a perfect implementation of D&D 5th edition but it turned out to not work very well in videogames so we improved from there".
Also, Larian: spent the year-and-counting of EA so far reverting most of the "improvements" they made over the 5th edition and struggling to go back to something closer to the original thing. And every time they did pretty much everyone was happier for it.
You have to admit it's ironic when you look at it this way. And that's assuming the original claim was the truth, which is something I'm growing more and more skeptic about over time.