I have, and can confirm Pojav Launcher is real and legit, HOWEVER

• That website you linked is bogus. A lot of Android projects end up plagued with malicious websites like this one. The only proper place to download it is their Github.
• Visiting their GitHub page, you’ll see Pojav got discontinued, and that you should get their succesor instead: Amethyst.

As their README says, download it by visiting their nightly.link or by going into the “Actions” tab on their GitHub.

Remember, only download it from their official GitHub page, don’t trust those shady websites from the Google search.