Yeah, this is a red herring. When people out in the media distribution world say "original trilogy", they just mean some version of the Special Editions.

Basically ever since they stopped explicitly labeling the Special Editions as such, there's been a lot of consumer confusion about what movie you're actually watching/buying/streaming. Which, I feel, is an intentional bait-and-switch scam.

The short answer is: unless you got it from OT.com, it's the crappy wrong version you didn't actually want.