There is just absolutely no way in hell that if the landing was really 3.5g the pilots wouldn't have felt it.
Doesn't matter if they were sat 800m forward of the wheels on duck feather pillows
The worst I've ever felt was 1.8g on a 777 & I can tell you there was no way we didn't feel it. Amazingly the cockpit door failed closed until all the pax disembarked