Yes, you are styling your own work with AI. Only very fanatic people may see it differently from a classic filter or the work someone does with Photoshop.
About hiring, I think it's ok but if you are a solo developer, and you are not doing something (as a final resulting image) that is a plagiarism of someone's image, I don't see the problem.
I think the AI tag, although I may not agree with the "generated" part, is a great tool to keep your work separated between people that think it's just a way of working, and people that think it's not because some ai was used.