Seeing as they defined their terms, your insistence on having a linguistics debate is pointless. If their definition of the nebulous term “getting by” matches your definition of “decent” (another nebulous term), that’s fine so long as what level you are actually discussing is defined. Which they did.
Beyond that, “decent” was never a word they used, it was a term I used quoting FDR in regards to the minimum wage, in regards to you talking about the minimum wage.
So I really don’t see the point you are trying to make.