My humble 1/50th of $1....
Try heating that pulley/shaft junction with a torch, then while still hot SOAK it with good penetrating oil (PBBlaster Kroil, etc)
May need to do that a couple of times. Also, use the heat & penetrating oil bath on the lower nut. Had to do that to get the spindles off my 38A deck last winter.
If I recall correctly, both the blade nut and the nut that is part of the pulley are 1-1/8". If you don't have an impact driver, use a LONG wrench and breaker bar on the socket.
(Where is that red-faced " uh-oh...I just popped a hernia" smiley when you need it?)
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