So you can either take this as advertised or not.
The end is quite open ended after all.
"But it is clearly said to be fictional!"
But!
1) there is a scene in which she used him as "live inspiration" for her shota work.
2) Giga Chad Kid was in that meeting on his mother's lap.
So yes, you can either take it as "yes, this is fictional" or you can take it as "Mom was telling her Shotacon friends that it is "pretend real life experience" work but...."
What to believe? That's up to you.