The University of Bologna was the preeminent Catholic university of its era. Its administration was led by bishops and cardinals; the papal legates were its supreme authority (source: New Advent). So, there is no clear basis that I can see to conclude that this G.A. Magnini is a "secular party" unless there's something more to go on. The text linked above does appear to suggest that Prof. Magnini had not viewed Jupiter through a telescope, for whatever that's worth..
Whatever the case may be, this G.A. Magnini is a rather flimsy basis upon with to make such a sweeping insinuation. LOL
I see. and was Aristotle, whose philosophy was the standard point of reference of the day, also an employee of the church?