Well, France has a really tough internal battle to pick their n°1 doubles team, because they have 2 very good teams but they have to pick one. For one side, it has Doumbia and Reboul, the 33 and 34 in the Doubles Ranking, which are a good couple, used to playing on clay and definitily a good contender for a medal, knowing that they are playing together for a long time now, but on the other side you have the n°11 in the world, Roger-Vasselin, which is almost a top 10, but he plays with mexican Santiago Gonzalez, so in the olympics he will have to play with his former partner Nicolas Mahut, ranked 52 in the world. So, its really a difficult choice.
The 2nd Doubles Team will be one integrated between 2 of the 4 singles players, so it can be anyone, and probably they are gonna lose in the first round.
Humbert only has 7 doubles matches between start of 2023 and today, and he only won one (with Shelton in Brisbane), and of the 6 losses 5 were in straight sets.
The Monfils case is worst, because he only has 5 matches between 2020-2024, 1 win and 1 loss in Tokyo Olympics with Chardy, 1 win and 1 loss with Bonzi in Montreal 2022 and a loss with Hurkacz in last year Laver Cup.
Then, Arthur Fils, 7 matches in 2023 (mostly with Luca Van Assche), only one win (in Wimbledon against the Tsitsipas brothers) and then all losses. Only one match this year, also with Van Assche, a loss in the Barcelona Qualy (6-2 6-1).
And finally, Moutet, only one match between 2020-2024, that it was in Wimbledon 2023 with Lestienne, a straight sets loss.
Giovanni Mpetsi Perricard its a better option if he ends up getting into the France Singles Team, because he usually plays doubles in the season, and he doesn't have bad results (Final in Lille Challenger in February 2024 and a M25 title in 2022). Same with Arthur Rinderknech (he won the title of the Quimper Challenger at the start of the year with Guinard)