In our house there is no boy or girls colours or toys. If DD wants to play football or DS wants to do ballet, no worries. Our kids, despite our pains to not push gender stereo types have turned out... well in the most common stereotypes lol we got DS a baby when he was about 2, he carried it around for a few days... then threw it away in favour of his trucks. DD is a girly girl that likes dresses and dolls.
I believe they could have raised him free of gender roles without going as far as to deny his sex and call him 'the infant'... and I do agree I don't think they have raised him without gender bias as they admit to pushing feminine clothes/toys so to me they ARE influencing him just in the opposite way.