Before I saw the video
@Tonyrodz had, we used to take the nut off and then thread back on to protect the axle threads and use a large dead blow hammer to break the axle loose at the splines. We then had washers in the shop that fit the stud diameter close and had flat nuts that would thread on to the studs and we would install a large slide hammer cage on the studs and sprayed penetrant where the seizing is taking place and we would take turns slamming the hell out of that large slide hammer. Worked in KC, Mo.