Yes he said biogenic gas was found in all of the wells drilled, but he did not say that "only biogenic gas was found" or "biogenic gas was the only type of gas found" or "no thermogenic gas was found".
No disrespect to Gralla, but his presentation I found hard to understand at times as he had a style of stacatto bursts, then pauses, etc. and it wasn't the easiest to follow.