Would it be possible to define writer's observation as an evidence of pomak language?
This citation's from "TSVETKOVA, B. (1963) ‘French travellers from the 15th to the 18th century, on the Rodopi region and
adjacent Aegean areas’, in: Rodopi Collection, Vol. 1"
Ottoman documents, information about the Pomaks is relatively scarce. Frenchman Paul Lucas was the first European to mention Slavophone Muslims in the Rodopi Mountains in 1706. Crossing the mountains from Plovdiv to Drama, he reached Pashmakli (the present-day Smolyan) and wrote the following in his diary: ‘And when we had covered a distance of seven miles in those same mountains and along very arduous paths, we passed through the village called Pashmakli. It is populated by Turks only, but they do not speak their language. Their dialect is, rather, distorted Slavonic mixed with Greek and Bulgarian
Probably turkish definition of paul lucas used by instead of muslim population.