Yang says Fox is good @ demonizing things and making them sound way worse than they are and the use it to turn their audience against a good policy.
Then he says Dems need to change the name when it is no longer advantageous or has been demonized.
If Fox is going to demonize whichever term you choose what's the point of changing it? They are just going to do it to the next term to. Then you spend all your time coming up with catch phrases and fighting some syntax battle that doesn't ultimately matter.
Dems want this politics thing to be some top down, disinfected process where the well to do can try and appeal to the common folk while not being amongst them (through the media).
Dems got to work harder, you have to canvas and talk to the public face to face where they live and hang out and explain what you plan to do for them. If that effort is consistent nothing on television will be able to sway them that easily. If someone came to your church, town hall, local bar and explained to you what Defund the Police means, some noob on TV telling you different isn't going to mean much.