Didn't read the article due to lack of interest, but if they are not pushing a Gender on their children, aka being Gender Neutral, and they are not harping on their children about making the choice, they are not promoting Gender Dysphoria. If that is how these parents are raising their children and Gender Dysphoria promotion is your conclusion about it, I surmise that you think Gender is a Social Construct more than these parents do.
That said, even though I believe people raising their kids this way mean well and way too many people in the past with Gender Dysphoria have had their lives destroyed due to their Parents and Society rejecting them, it seems to me that this condition is so rare that focusing so intensely on it is likely a waste of time. Just live your life, raise your kids to be the best they can be, and if they turn out to have Gender Dysphoria or Homosexuality, be accepting of it. It doesn't need to be ones' life mission. That said(#2), sometimes such ideas need these types of enthusiasts/revolutionaries in order for certain ideas to become accepted more widely in a Society. So even though I am somewhat dismissive of these people, I appreciate their willingness to bring attention to the issues, I just hope they don't go so far with it that it ends up hurting their kids.