This is not hexagonal architecture

[MyEidos]

The current project doesn't satisfy the requirements of hexagonal architecture.
Ex: concrete (!) EF DB context (!) is used on the domain layer:
public DealDomain(ApplicationDbContext dbContext)

Which creates strong coupling with DB layer.

[Innokmm]

I agree, the first thing I've noticed in the Domain layer is a reference to Persistence, which as per comment from MyEidos ends up as dependency to the EF:

Shouldn't Persistence depend on Domain layer?