It says a lot about the passion of their team, I think. Larian was not even on my radar until a little while after DOS2 came out, and while I enjoyed dos2 I burned out in act 3. It was, however, plain to see that they poured buckets of care and attention into the game, even if it wasn’t exactly for me.
With Baldur’s Gate 3 made an upward trend in quality and kept the same love, care, and attention. If that level of care and attention is present in their previous titles (I have no idea), then I think it was all but inevitable that they’d find this critical success.
It sounds like they mean that they projected their insecurities onto their partner, as opposed to just sharing the insecurity. The latter is good and healthy, the former is unpleasant at best and harmful at worst.