I actually had a conversation with the head of the DRE who confirmed that wholesaling a contract does NOT require a license. And that they won't enforce that. Although their agents sometimes become a little too motivated.
This does not change the rules about use of entities requiring a license (a very dumb rule that isn't really enforced either). So an individual wholesaling does not require a license, but doing it in an entity does (as does any real estate transaction where the buyer or seller is an entity) because of the entity involvement, not because it's wholesaling.
But like all transactions involving entities, there are a million reasons to use them and I say keep doing transactions in entities. I've never see that, alone, be a problem.
Jeff is correct on your marketing. That's the big red flag. You never know when an agent with a bug that thinks you need a license for everything reports you. But I have many clients who aggressively market their wholesale deals without issue. Just be smart, use disclosures and be honest.
Jeff