He's been anti-complexity for awhile. the matrix ecosystem is far more complex than signal.
And then he turns around and releases Signal-Desktop based on Electron?!
And two, "In Riot, Admins are shown in the membership list with a golden shield, and Moderators are shown with a silver shield. Other clients use similar metaphors."
If you actually used Matrix, you'd notice in whatever client that you're using that it's actually very easy to see who the mods are.