No, Parler was not hacked
We can spend days arguing on the definition of "Hacked" so let's not bother.
The "not hackers" did create a horde of admin accounts.
When a user deletes a post on Parler, guess what - they just flip a bit and keep the post. The Admin accounts have access to all the deleted posts as well so it wasn't quite a simple scrape but got all the stuff that the users thought was gone for ever.