I assume you mean this site:
https://www.bookwhip.com/
It looks like they sell services to self-published authors. I'm not a fan of that business model. If you have that sort of money to throw around, you'd do better shopping around for editors and cover designers who fit your project.
Nothing really pops out as suggesting it's not a real site. The majority of threads here are about places that are real (outside of that one person who was roleplaying at being an agent). But real isn't the same thing as being a good idea.