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.
Yeah, I'm sure the guy has time to run his mom's social media account. What's your reasons or evidence? Did you consider maybe it's a social media manager one of them hired running the account?