Oh dear... they've gone along with the hearsay rather than the proven history that he stayed with Fux in Vienna...
Looking forward to the recording, though!
Indeed, Zefiro’s Alfredo Bernardino writes in the booklet, without any reservations:
“The young nobleman [Frederick August II] (...) brought with him to the capital of the “Serenissima Repubblica” some of the leading musicians of his court orchestra, including the first violinist Georg Pisendel, the oboist Johann Christian Richter and the double bass player Jan Dismas Zelenka. (...). While Pisendel struck up a friendship with Antonio Vivaldi, many of whose concertos and sonatas he copied, Zelenka took lessons from the charismatic Antonio Lotti.”
I can recommend the CD.