Yes, I thought the same thing. But 3 tons of pressure was not sufficient to budge that housing a millimeter. It is attached to the axle with tremendous force.
I think his point is to push the axle out of the bearings, not try to pull the flange off the roller. If you remove clips from both ends, can you push the axle through the bearings? Then you can pull the bearings from the flanges as noted above.