Not an ignorant question at all, a rather good one in fact. I would suspect not, the ESC is rated 20 amps, and somehow senses the rotation of the motor, so if the motor was stalled, I don't think the esc would even try to deliver that much, but of course I could be wrong. Does the draw of a BL motor go up in the same way as a brushed motor when it is stalled? I dunno, but I'll bet someone does...
Why don't you try it?
In any event, if the esc is rated 20 amps, then a 20 amp fuse should be enough to protect it, so if you use a 10 amp fuse, stall the motor while giving it throttle, if the fuse blows nothing will be harmed and we will know the answer, or at least part of it.

Oh, and I've managed to crash twice since the mod, dead-chickened for about 1 or 2 seconds both times because I was in idle-up and forgot to hit throttle-hold. I'm sure it would have fried a 3-in-1 but the ESCs obviously survived fine.