Sorry if I’m being nitpicky here, but falsetto is those breathy high-notes (think beejees, or Rivendell if you want to stick to rush). This song is all head voice. No worries though, I had to Google this just to make sure I wasn’t lying because I wasn’t certain.
I think the differentiation between those terms is tenuous and depends on whom you ask, but regardless, I’m not a tenor like Geddy Lee. I can’t hit those notes in my normal register. I’m a bass. So to hit most Rush songs, I have to shift register. Whether we call that “head voice” or “falsetto,” either way, I’ve beefed up that register singing Rush and other high-voiced rock (and also descants for fun) so it has lost a lot of the weakness commonly associated with the term falsetto. It doesn’t have the timbre of an actual tenor, but I can still sound remarkably good considering it’s outside my “normal” range.
Edit: Just to clarify, I don’t disagree with you that Geddy Lee isn’t singing falsetto, I’m saying that for me that song is a good way to flex my falsetto. Which always shocks people who hear my low voice. 😁