The force on the gates remains the same. The motors are mechanical hinges that hold the paddles, and they have not changed. Only the paddle itself has mainly changed.
I assume they did away with the glass more for safety and simplicity. Many years ago, TfL used to have those highly powerful pneumatic gates. The injuries they caused due to careless but fare-paying customers, and especially children, quickly put an end to high-force gates.
The gates are mainly there as a deterrent. The majority of customers are fare-paying, and in the case of an emergency, they should not have to risk their lives, as in the video, by struggling to push against the barrier if it fails to open in an emergency, which is rare but possible with all things mechanical.
It also gives gateline staff less direct exposure to these gate pushers. Instead of trying to intimidate and possibly abuse their way through staff, the majority just push through and keep moving.
As to the original claim, no the force unless toned down again is not from the paddle directly being changed.