Just for the record, the Auschwitz Museum organization has a presence on Mastodon, and any mention of Elon Musk should be given a link to some place that he obviously wants to bring back.
This is what he is endorsing:
FORMER GERMAN NAZI
CONCENTRATION AND EXTERMINATION CAMP
"KL Auschwitz was the largest of the German Nazi concentration camps and extermination centers. Over 1.1 million men, women and children lost their lives here."