This means the audio is the official French dub used in France (VFI), rather than the "Doublé au Québec" (VQ) version. It is generally considered the "standard" for French speakers in Europe.
The final battle remains one of the most ambitious sequences in film history. The "Portals" scene is arguably the peak of the superhero genre. Avengers: Endgame TRUEFRENCH DVDRIP 2019
If you are looking for a "solid review" of the movie itself, The Movie: Avengers: Endgame (2019) This means the audio is the official French