Anonymous scientists? lol
It likely means that they are fake.

This bullshit declaration has been invented by Koch brothers through their American Institute for Economic Research which is a conservative, republican think tank that has been responsible for persuading some scientists to sell off their credentials to spread pseudoscientific climate change/hoax propaganda, mass climate change denialism and science confusion.
The majority of these so called "medical & public health scientists" and "medical practitioners" in this declaration have been proven to be fake and/or have no medical or scientific credentials.
Just because someone put themselves on the list as a scientist or medical expert, does not make them so. All you need to do is put the random name there, email and address
It's been found that the whole list is full of bullshit scientists and medical "professions" and names like massage, Mongolian khoomii singing, hypnotherapy, the Macarena, etc.
It is just as bullshit as the list of fake experts crafted for bullshit "Architects & Engineers for 9/11 Truth".

There is a worldwide scientific consensus that this declaration is a dangerous, bullshit idea.

No wonder such bullshit was signed by some many "concerned citizens". Scientific illiteracy pervading around the world and particularly in the USA is shocking.
According to polls, the vast majority of Republicans believe in QAnon to some degree (some of them believe in some part of it while about 20% completely believe in all of it, etc).

It is evident that you are scientifically illiterate too. These manipulative, science-denying think tanks feed on foolish Karens like you. They are as bad as Russian troll bots infesting social media spreading pseudoscience, fake news, and lies.