The new lawsuit marks the first legal filing by Trump’s team after FBI agents carried out their search on August 8 and underscores how his legal team has struggled to coalesce around a singular strategy.
Katelyn Polantz, Kaitlan Collins, Tierney Sneed, CNN, “Trump’s legal team asks for ‘special master’ to go through Mar-a-Lago evidence and determine if some should be returned“, 22 August 2022
I would expect any legal strategy by Trump or his lawyers to be singular, but the writers probably mean single here.
What is singular is that two of the writers are named Caitlin, and neither spells it the conventional (i.e., Irish) way. Novelty for the sake of novelty, but within the context of slavish conformity to fashion.
Crutchfield's Orthoglossary 
So we assume the Caitlins mean a singular as opposed to a plural strategy, not singular as in unique. The overuse of unique drives me crazy and rather seems to demote the word to merely mean “interesting.”