You have very odd ideas about what this "commitment about your terms of employment" is.

Yes, its true, legally you can not, and should not, be penalized for taking parental leave (a point I made in my original post). At the same time, you should not get some guarantee that because you are on leave you can't be treated the same as if you were working.

If this guy would have been fired had he been working, a parental leave doesn't act like some sort of "get out of jail free" card.