Yes, that is my site.
I have established now that the "Cairo Gang" photo is nothing to do with Bloody Sunday, and is in fact a photo of named people in F Company ADRIC. It is probably "posed" for the camera, and may well have been fed to the IRA to establish the credentials of a double agent who fed it to them.
Anyway the NLI tell me that they will amend their records to refer to it as that. I doubt that I can get all the errors removed from history books

but the "Cairo Gang" never existed
I went on to look at Bloody Sunday as a whole. The myth was that the men in the photo were the men shot on Bloody Sunday, which never seemed a runner to me, but took some time to prove who they really were.
One of the untold stories of Bloody Sunday is the raids that were unsuccessful - because the target had moved or was not at home when they called. And also the ones where the wrong man was shot. These are the ones nobody wants to talk about.
Collins intelligence gathering machine was good, but certainly not perfect - the myth that is was perfect is another myth that takes time to shine a light on.
The you get an odd raid like the one where Lemass was involved in, about which little is spoken. I am not sure if this is because Lemass was involved, or because they shot the "wrong" man.
They may have hit the correct target (the man they murdered, Baggallay, was a courts martial judge, but there were a lot more than him in Dublin at that time - and no particular reason for him to be singled out). However the IRAs reason given for Bagallay's murder is his involvement in the death of Lynch some time earlier is somewhat tenuous. Baggally was not working in intelligence.
So one can take one's pick as to why little is said of this raid (the same argument is true of the murder of Fitzgerald at Earlsfort Terrace). Collins objective on Bloody Sunday was undoubtedly to hit the British Intelligence machine hard - Baggallay and Fitzgerald were "merely" British officers and not intelligence. The men murdered in the Gresham Hotel (MacCormack and Wilde) were civilians with nothing to do with intelligence, neither was Smith the landlord at Morehampton Road.
I do not have any axe to grind, but I do feel that much about this period in Irish history has been written in a way that now needs to be looked at afresh. Collins infiltration of Dublin Castle was a classic in the annals of intelligence gathering, but he did make mistakes