The freewheel seems completely seized, perhaps even fused/welded to the motor at this point. I mean, if a wrench setup like this can't get it off...
Next up, impact driver? Torch? Perhaps you can split the motor with it still attached?
AFAICR, there's nothing to stop you from disassembling the motor with it still on there.
As for getting it off, in general it's a LOT easier to take freewheels off while the hub is still in a wheel (the larger the diameter, the easier it is). Not that that helps you much at this point. :/ The problem you're having is likely that the steel freewheel body has wedged itself in really well into the aluminum cover / threads, from pedal torque, and it's likely no grease was used to install it (which can help when removing one).
You can try using a "straw", with the motor placed axle vertical, freewheel side down, to get PB Blaster or some similar stuff into the thread interface between motor cover and freewheel. It cant' be gotten in there except between the freewheel and cover, and there's not much space, so it's hard to see and get the "straw" in the right place up against the cover's freewheel mount. Let that sit overnight, then try the freewheel removal procedure again.
But you don't want to apply too much torque to it, or you may break the motor side cover.
That would suck. So unless you really need to take it off, I'd just leave it where it is.
If the puller does not simply begin to pull it off, you can use a few methods to help:
Heat the covers up significantly but not excessively (hairdryer on high, etc), so they expand more than the steel ring inside.
Tapping with a rubber mallet around the seam as you slowly increase tension on the puller.
Use some of the same lubricant in the seam between the covers. Just a few drops, in equally spaced points around the circumference of the seam, then let it sit a while, then more drops in different spots, and so on. You don't need it to be dripping off--just to get into the space between the cover and the magnet backiron ring.