I don't think that frame is French threaded. Looks to be early 80s paint and graphics, which would mean it is an English threaded frame.

"Peugeot bikes prior to approximately 1980 have French threading for both bottom
brackets and forks/headsets. Around 1980 Peugeot began converting over to
British threading or 'B.S.A.'"

http://www.cyclespeugeot.com/Threading.html