There is no market to tap into. This is something that a very few lucky are able to do. If 5000 people here try to replicate this, i'd bet you good money 4995 will fail. The company who owns this "influencer" is a marketing company. They have resources to grow an IG page. A lot of fake followers. A lot of bots. A lot of money spent on advertising. It's not simply creating a model and voilá.
If you can make money with a fake influencer, you can probably make money with anything else. You can create a page about videogames and make money with it. You can create a page about photography and make money with it. There's nothing inherently valuable in Ai models. In fact, they exist in abundance. Everyone is trying to do this and most are failing. There's nothing to "tap into". There's no "great opportunity" out there with this. Just the usual: Very lucky and resourceful people sometimes are able to make good money online.
Plus, where's the proof they're making 11k? You have none. This is advertising in itself, and you're eating all up like oatmeal in a cold winter's day.