Jack Ma was not, in fact, disappeared, though? He lay low for several months while being investigated for financial crimes. He is still the largest stakeholder in Alibaba, and still has a net worth around $27B. It's not even like his assets were frozen.
Disappearing for 6 months immediately after making a controversial speech about the financial system dosen't look good to investors. And we all know it's because of his speech, not because of "financial" crimes when the Ant Group is heavily works with the CCP given the scale of its activities.