Sorry, meant to reply to this last week but was locked out of my account and never came back before now.
As someone who tracks Rockets uniforms too and is a fan, we're all confused. It was reported by people that the team shop had been selling the full red trim version for months even before it was initally pointed out which debunked the claim that it would be changed since it was being sold online. The team hasn't addressed it and we're all in the dark. One of the possible explanations I can imagine was it was just being sold as a fashion jersey (jerseys that aren't actually worn on court) but those usually have more obvious and prominent design differences than this.