I would be surprised if he makes as much at Marist compared to York. And a public school teacher's pension is typically quite a bit more than social security. And you can still get a partial pension if you don't teach for 30+ years. Returning to Marist wasn't about the money.
It is if you are tier 1. About a third of teachers are tier 2 and most wont make anywhere near what current teachers make at the same age due to changes in contracts. Plus you have to work 12 years longer. You take massive penalties on the pension if you retire before the target age. For example if you retire at 62 in new system, it is a 30% penalty on what you are suppose to get.