But the building before the bombs fell was a testing facility on making deathclaws (so expect super mutant deathclaws) and when the bombs fell the scientists were still creating more specimens of deathclaws for the military. The scientists during the radiation spread received the FEV virus making them ghouls but with the reptillian DNA vials and samples for the deathclaws transformed the scientists and members of the facility into reptillian like ghoul race. (Now you caught me Im a argonian enthusiast) since they are essentially ghouls they can live extreme life spans just like them. As does radiation rejuvenates them and sun light instead gives them energy.
So what do you say criticism is nice (just not too harsh) as well if you like the idea of the deathclaw ghoul race but want to edit them around a bit I don't mind.