[xorcist]

It's something akin to a service provider in SAML parlance, if we are to believe reporting. How can it be air-gapped?

And if we are to believe the hacked company, it is a development environment with test data in it. That remains to be seen, but is a risky thing to lie about. If there is production data in the leak, we will surely know about it.

[UltraSane]

At the high end you can use data diodes to isolate critical data.