It's very simple. The only two teams so far to show interest in Romo are the Broncos and Texans. The Broncos may "want" Romo, but don't "need" him, while the Texans need and want him. As such, there is only one real interested party, which is the Texans.
What Jerry is doing is announcing to the league they can talk to Romo about his contract, which alludes to the fact that a reworked contract might be a possibility before or after a potential trade takes place.
The reason for this is simple .. he's putting pressure on the Texans, who until now have been the only interested party so they could wait the Cowboys out. The goal is to create a potential for more interested teams to enter the mix which will 1) greatly reduce the chance of Romo being released and 2) push the Texans to pay more than they want draft-pick wise.
The Texans' fallback plan was probably to wait until after the draft and then offer a 2018 draft pick instead of a 2017 if they were forced to trade for him. Jerry is simply upping that time frame.
It has and continues to be a case of who will blink first.