No it wasn't. The Atari 2600 was released September 11, 1977. Screamin' Eagle opened April 10, 1976.
Yes, I will stand up for facts. Yes, you could have Googled that like I did and could have presented correct facts to prop up your straw man argument. Yes, it's a straw man argument because whether people used microwave ovens and 8-track casettes has nothing whatsoever to do with the subject at hand.
Ask any normal people (or "GP" if that makes you feel better about yourself) to name a coaster at SFStL, and the two answers you'll get most often are Screamin' Eagle and Batman. That's what makes something a signature item. Not the best, most popular, whatever. It's the thing they're known for. The Big Mac is McDonald's signature item. It's what they're known for.
There. End of stupid discussion. Let's get back to complaining about Ninja and whining about Georgia taking our hyper coaster.