Andreas Antonopoulos has contributed many things for Bitcoin community, from non-profit intially to later with sales of his books for examples but he made his book open-accessed so many people can learn Bitcoin without purchasing his books.

The sentence is more like click-bait, because it's not too accurate to say Andreas is the man changed Bitcoin forever, and the best ever, greatest advocate. His contributions are huge and deserved to be recognized by Bitcoin community, but amplify it like this, I disagree.

He has an account here, was appointed as a local moderator but left the forum because he felt it is too structural cumbersome.