Clean Architecture isn't anything strictly defined. It's more of a set of higher level principles and it's not about the implementation, it's up to you as a developer. UseCase is so abstract of a concept that you can't even say "We are not using UseCases", it is as abstract as module.

BLOC is just a MVVM/MVI Presenter like thing that needs to be wired the same way as other Presenters, it should not contain all app/screen logic implementation, etc. etc.

Old but new.

https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html