It's been a long time since I used Llblgen and I see that a lot has changed. Just had a question regarding the generated code. Can Queryspec be used to fetch or run queries on Entity Framework model?

If I am reading the documentation correctly, queryspec only supports adapter and self-servicing llblgen models and not the EF models. Is that correct?

That's correct. EF only uses its own query system which is Linq. (In EF6 you can also use EntitySQL but they've discontinued that in EF Core).