Politely suggesting moderate policy reforms in the context of a business workshop dedicated to such matters is hardly "publicly fighting with regulators" let alone anything deserving of being disappeared.
So you talked to Jack Ma? Lol you read a bunch random speculation about how he’s missing when there’s no proof. The. Try to construct a narrative from it
All this speculation could be laid to rest with egg on the face of western media outlets with just one proof-of-life phone call. The CCP, who he would like to get back in good graces with, would certainly want that. So why hasn’t it happened?