I don't think the point is that it's his fault they have crazy laws. I think it's his fault that he didn't anticipate this would be a problem. I'm sure he did ZERO due diligence. I guarantee this came as a surprise to him.

A failure to do market research is absolutely a company owner's fault.

Indonesia being Indonesia is not musk's fault, but not doing the bare minimum of looking into things is musk's fault.

You are extremely charitable my friend but Indonesia is not going to stop being Indonesia for Elon, so yes this is Musk's strategic error. You don't abrubtly change your entire multibillion dollar brand without doing some due diligence on the implications it will have. Or maybe he truly is deranged enough to believe he doesn't need customers in 4th most populous country to run a successful social media site.