Found a $5M donation article (not personally fact checked). https://www.bostonglobe.com/2021/01/19/nation/elon-musk-donates-5m-coronavirus-research-boston/ htt

Found a $5M donation article (not personally fact checked). https://www.bostonglobe.com/2021/01/19/nation/elon-musk-donates-5m-coronavirus-research-boston/ https://www.bostonglobe.com/2021/01/19/nation/elon-musk-dona... Presumably even if that wasn't the bet, he can backfill anyways so yes seems to be the likely answer.