Is there a confirmation that he has forfeited? Besides L'Equipe's article...but on twitter those French Journalists are still saying he's wanting to play.
As of this morning, Eric Salliot (a French journalist who saw Gilles in Melbourne) said Gilles hadn't officially withdrawn yet. He said the FFT had (wrongly) reported that Gilles had pulled out, and said this was the source everyone else was quoting. He didn't think that Gilles would be able to play, though... his theory was that Gilles was trying to help out his fellow Frenchies - if he withdraws late enough (I think after play officially starts on Monday, or maybe after Tuesday's OOP is released, not sure of the rule) then no other players will be moved and lucky loser (Frenchman, Stephane Robert) would replace Gilles against Daniel Brands. There is a little confusion about who would be moved if Gilles withdrew earlier, but the two players being suggested are Benneteau and Monfils - and both would probably much rather stay where they are in the draw.
So it does seem possible that Gilles is just trying to do his French team-mates a good turn here... although it is fantastic news that he is off crutches already, and walking unaided.