Was The Spinosaurus Attack Film Studio ever a real LEGO set?

Yes it was real. I didn't have this particular set but I did own other dinosaur sets that used some of the same pieces.

SasquaDash

I meant more of whether it was an actual official lego set and not a bootleg

It's official.

Here's a listing for the full set, box included: 

 https://www.ebay.com/p/79937427 

Sorry for taking so long to reply.