I don't remember the title of that thread but Bill and I both commented-if I remember correctly-to never say never.
If you have rock substrate with windblown frequency, it "could" happen.
I feel it is possible but probability is low.
Another possibility at your location is that at your altitude, the photo period may drive the walleye to spawn but water temp may be such that the female never releases eggs and actually reabsorbs them.
