I doubt it is ‘for good’. I believe they are simply giving notice that Singularity is being intentionally put in this mode to head off the threads and reports they’d get if they make the change unannounced and letting us know they’ll tell us when they switch it back on so we know we don’t have to keep checking it to find out.

All test servers are probably not created equal. They may run on different hardware or access/emulate a different more limited subset of features as compared to Sisi. It seems logical to assume there is a good reason to do their testing on Sisi to provide the incentive to put it in VIP mode even if the ‘why’ of it is privileged information.