Maybe he misspoke, but in no word, did he say he compared to DOS2 EA.
If that was on his mind, his clarifying statement "thats early access, the actual complete game is gonna be much bigger than that" would make no sense whatsoever. Ofcause the full game of BG3 will be bigger thatn DOS2 EA content. That was not the question, nor was it the answer. The question alone would be ridiculous and the answer obvious.

The question was clearly what ammount of content would be in BG3 EA and he clearly stated that its comparable to DOS2 full game, even clarifying it. If he meant DOS2 EA for comparison, he would have not made the second statement for obvious reasons. well. but question answered i guess. I then hop acts 2 and 3 will be significantly bigger than act 1^^