Where does “bisan kalamayan pa” come from?

bisan kalamayan pa (Cebuano) comes from Cebuano pa-, from Proto-Philippine pa-, from Proto-Malayo-Polynesian pa-, from Proto-Austronesian pa- — causative prefix.

bisan kalamayan pa (Cebuano): No matter how much something is sugarcoated, disguised, or polished; used to emphasize that an inherently bitter reality, toxic attitude, or a person's own naturally unappealing/pathetic state cannot be made attractive or acceptable through superficial sweetening