I don´t know if this specific paper is new, but RA4 papers on a polyester base aren´t a new thing, they have been around since the early days of RA4 and are available from most companies making standard RA4 papers.

A long gone german company -Argenta in Munich- once even coated a variable contrast bw emulsion on polyester... but they had not much time left until they finally opened the window blanks in the emulsion plant.