"The Untenable"
Indeed, Tang Cen's Cultivation Technique was called "The Untenable."
If Zhou Li's "Save The Old Man" can be called an abstract living fossil in the Cultivation World, then "The Untenable" would be the ultimate artifact of the abstract category.
From the way the names were chosen, the literal meaning of "Save The Old Man" is someone coming to the rescue of the old man. As for "The Untenable," that's to say...
Sigh, it's really not the case.
The creator of this Cultivation Technique was not someone named "Infeasible," nor was it a person named "That" who said it was not feasible.
The creator of this Cultivation Technique was an utterly unremarkable cultivator who had no particular hobbies other than delighting in one thing.
Being argumentative.