They’re still providing the code for people who buy the compiled software. And they are not restricting their ability to redistribute that code. So it’s still compliant with the GPL in the letter. However, if you redistribute it, they’ll refuse to service you further versions of the software.
It’s clearly a loophole because they can argue “ackshyually, we didn’t restrict you, we just don’t want further businesses with you, see ya sucker”.