It has been reported that this was merely a symbolic petition. They actually can’t revoke his citizenship, nor should they. It sets a dangerous precedent. BUT they can arrest him in this country for treason.
https://www.cbc.ca/news/politics/elon-musk-canadian-citizenship-1.7468330
https://www.cbc.ca/news/politics/elon-musk-canadian-citizenship-1.7468330
Comments
Being pro-secessionist wouldn't be treason, for example.
It goes like this
(a) using force or transferring secrets
(b) conspiring to do (a)
If your definition is too broad, any Fox News reporter in Canada could be arrested.