I tried it. And yes, it is blocked. But the report not said NX:
2021-07-27 13:10:55 XXXXX services.googleapis.com OK
But the browser says:
404. That’s an error.
The requested URL
/was not found on this server. That’s all we know.
But it looks like this is no "site" to show in a browser. It don't work too without adblock.