As stated by another comment Elon Musk's mother posted an AI-edited photo marked as such. It got edited right away to remove that label.

There are ample reasons to believe that Elon Musk is running his mother's account and that the photos weren't even real putting in question that he even had a birthday party.

If you ask Grok about what this means it will always take Elon's defence. It will vehemently deny that Elon would be capable or willing participant of such a thing even if you point out that he faked being a world class gamer, buying accounts that had done all the work and showing none of the skills when live-streaming.