You're assuming that this guy was actually being prosecuted for crimes or that this guy lacked loyalty to Xi Jinping. A tremendous number of top generals and leadership has been wiped out in a short time and not necessarily refilled, and it's not because China has a huge disloyalty problem.

> it's not because China has a huge disloyalty problem.

Why not? Dictators often purge anyone who is a threat, often because they form a possibly competitive power structure (regardless of their intent), and often because of paranoid perceived disloyalty, and for actual disloyalty.

And corruption is the cover story they commonly use - it's vague, general, the public sees enough gov't corruption to believe it and to hate it. Trials are not needed. Off the top of my head, Putin in Russia, Mohammed bin Salman in Saudi Arabia, ...