I've seen it on other lakes. I've seen bass fry in November and December before so I know some of them did successfully spawn.
Few years back I saw small fry shallow in a 26 acre private tank first week of December. It's very deep (35+ feet makes up 80% of it) and super clear.
I scooped some of these unknowns up in a bucket and put them in my koi pond.
By early spring they were 3 inches long and clearly bass.
How were they less than fingernail size the first week of December if they had not been born a week or two before in November?
The tank is not stocked... so riddle me that.