That claim is preposterous on its face.
Yeah, they might have stretched it too far.
St. Josaphat was born in Lithuania about 1580 into a Catholic family and early promoted Catholic unity in a country divided between Orthodox and Catholic. He entered the Byzantine monastery of Holy Trinity in Vilna in 1604 and was elected Catholic archbishop of Polotsk in 1614. While clinging firmly to unity with Rome, he firmly opposed those Latins who saw unity only in Latin terms and would suppress Byzantine traditions in the name of Catholic unity. He firmly opposed the Latinization of his people and made enemies and severe critics among the Latin clergy of Poland.Politically, the Catholic and Orthodox clergy were rivals in Lithuania, and the archbishopric of Polotsk was one of the contested sees. An Orthodox archbishop of Polotsk was appointed, and Josaphat was accused of taking office invalidly. Many of his Byzantine Catholics were won over to allegiance to Orthodoxy. Even the king of Poland wavered in his support of Josaphat, especially when Polish bishops accused him of betraying his faith by not Latinizing his diocese.