If it’s a version of an old 45 recommended by the Ghostbusters themselves, then it doesn’t have quite the same weight. They were meant to be a pop-culture phenomenon, not dudes who’d have to commission their own song.
(And I say this as someone Who finds the cynical marketing nous of Venkman to be one of the core things that makes Ghostbusters so funny: the big garish sign and logo, the endless interviews and covers, the actual scrolling marquee on Ecto-1A, for heavens sake! I love it all, but the song didn’t feel part of that. The song felt like a response to their fame.)
But yeah, I don’t know the actual context and I’m likely tilting at windmills. It’s probably nothing I’ve said above and totally fine. Speculation drives a person bananas, eh?