I would like to draw your attention to the words "de facto".
He was de-facto forced into early retirement.
He hasn't chosen to retire, or officially retired.
BUT he has been removed from any professorial/rector position, as well as from any public work of the SSPX -- including confirmations and any public teaching/sermons.
So although he hasn't officially retired, he might as well have. The result is the same as if he had. That's the definition of "de facto".