I think I know, unfortunately.
The "long time mayor of this shipping point" is a well known figure of the region: former governor Sinyo Harry Sarundajang who was mayor of Bitung from 1986 to 2000. It was him and not any of his three daughters who studied in Paris in the early 70's at the Institut International d'Administration Publique. It is unclear if he got any diploma from there but he managed to get a certificate of proficiency in French. He indeed speaks reasonably french.
The Sarundajang tribe are close neighbors, staying in Winangun where I live.
Vanda, his oldest daughter who is anggota DPR--RI at the moment, was still a teen (she must have been 14 or 15) when the 12m high Eiffel tower in Bitung got erected. She has a S1 from UKI, Jakarta. Nothing from France. Eva and Shinta the two youngest daughter were still in primary school at the time.
By the way, if one day you go further south in the Gorontalo province, you also have an Eiffel tower in Limboto, a few kilometers before Gorontalo. That one is cool because you drive through it. It is also "much" higher than the one in Bitung. I think it's about 30m high.