yeah blones its for ripping the paint back before rendering over. not sure how well they do the job tho.
I looked at a job for render last week where the builder had stripped all the old paint of a sand and cement rendered building, they used a diesel powered steam cleaner but there wasnt a scrap of paint left afterward, it left the surface slightly perished too - great for my mesh coat but dont think it wouldv been that easy on painted brick