This is not only untrue, it's very easy to check.
McCowan Station - Last train Westbound: 1:16am, all week
Kennedy Station - Last train Westbound: 1:31am, all week
The difference is only 15 minutes.
In fact, the RT has the same virtually timing as terminal stations on the YUS Line (except for Union) The final train south from Finch is at 1:16am. From Sheppard West it's 1:18am.
No station has trains leaving at 2am. Generally speaking, if you show up past 1:30am at most stations, you're out of luck.