there is a comment on the article to this effect, for what that's worth:

Angel

Hello Kris,

A lovely idea, but I won’t be visiting any public bathhouse any time soon. For many of us, the pandemic isn’t over. It’s contagious, airborne, and still killing and disabling people (including healthy people who have previously been infected and been ok) every day. Some ways to address the transmission of covid in bath houses can include rigorous HEPA filtration; required testing (using LAMP tests, for example, which are €10/test once you have the machine to read the results (another few hundred euro), and you can pool several people in one test); and maybe masks (I’ve read that they don’t work if they get wet, but I also read an article where someone tested several and went swimming with them. From memory, a regular Aura (~€1) worked nearly as long as an intentionally waterproof model). None of these are cheap by my standards. Not sure what you do about warts, foot fungus, and many other common bath house diseases.

Thanks, Angel