It's a real pressed CD that's also black. The front side is made to look like a 7" with a label and grooves. They went out of their way to make it look nice. The phrase "50th Anniversary Recording" is clumsy though.
Like you said, they sat on these recordings for decades, not just this particular concert. Now they sometimes choose to release lesser performances instead. At the time they might finally release the Rotterdam 1967 & 1969 shows officially, a lot of the older fans could have either gone deaf or to their graves. Anyway, I'll be first to pre-order a Sony release, as will most who purchase this disc, I suspect.
Just get off your high horse. This was released in the EU, and within the EU it is likely a legit release. It's currently not even available in the USA.