Why did the talk about an UAP building facility under the ocean only started to be said by all the famous UAP people after the 4chan whistleblower posted that information?

Something that bothers me a bit. Before 2023 when the 4chan whistleblower posted his theory or whatever, none of the UAP guys mentioned an underwater building facility. It was only after that 4chan user that this talk about UAPs being some sort of autonomous vehicles built to sur...