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>IUTによりABC予想は解決されたと言ってるフランス人数学者って誰？

うむ
下記の Promenade in IUT September 2020 - April 2021 における
仏人2名 Dèbes, Fresse (Lille) 少なくとも この仏人2名は
IUTの支持者だ

(参考)
https://www.kurims.kyoto-u.ac.jp/~bcollas/Promenade-IUT/index.html
Promenade in IUT
Promenade in Inter-Universal Teichmüller Theory
Org.: Collas (RIMS); Dèbes, Fresse (Lille).

The goal of this seminar between Painlevé-Lille (France) and RIMS-Kyoto (Japan) — September 2020 - April 2021 — is for generic arithmetic-geometers to gain a general understanding of results, insights and techniques of IUT.

https://www.kurims.kyoto-u.ac.jp/~bcollas/Promenade-IUT/IUT-schedule.html
Programme and schedule
10/08 T1.1 Abc & Szpiro conjectures: Roth and Belyi Cluckers - Fresse
11/5 T1.2 Abc & Vojta conjectures: heights and ramification Dèbes

https://www.kurims.kyoto-u.ac.jp/~bcollas/Promenade-IUT/documents/RIMS-Lille%20-%20Promenade%20in%20Inter-Universal%20Teichm%C3%BCller%20Theory.pdf
we refer to the Programme for descriptions of the talks and associated references.