I should also think about cultural context. If Mbah Maryono is a traditional figure in Indonesia, perhaps there's a meme, protest, or social movement involving a Twitter account that was fixed or corrected. Or maybe someone created a parody account that was taken down ("fixed") by the real person or the platform.
Another angle: sometimes in online communities, people use phrases that aren't accurate translations. Maybe the user is referring to a situation in another language that's translated to English as "Twitter Mbah Maryono Fixed." For example, in Indonesian, if someone says "Twitter Mbah Maryono tetap" and it gets auto-translated to "fixed," it might not make sense. Or maybe it's from a different Indonesian phrase that got mistranslated.
Another thought: perhaps "fixed" here is slang or jargon used in a specific community. If I'm right about Mbah Maryono being a public figure, then "fixed" might relate to a political or social issue where a decision was made, and then reversed or corrected ("fixed") on Twitter.