I would not be surprised if Crewfriend is not rather overclaiming his/her instransigence as being the reason for achieving 48 hours due to a diversion.
If it indeed happened, I suspect it to be more likely as a result of the pre-Christmas disruption that saw up to 30 aircraft displaced from LHR/LGW due to closures for periods of several days.
It is likely to be just more BASSA bluster, imho. One thing for sure, when the Disruption Agreement is invoked (imposed or agreed), then any crew member claiming 2 nights would be instantly carpeted to explain themselves, at this risk of suspension etc.
As I said, nothing to see here, move along, it's just BASSA bollox (again).