You could say that about most of the subway infrastructure, but the vast majority of the system remains clean. As per the article: "the kiosks can be power-washed".

Also, most public transport riders don't want to touch anything. Wonder how often those screens will be disinfected/cleaned?

I think there are a noisy minority that care about this. The vast majority of people I see are happy to hold onto rails as the train moves. I'm sure the touchscreens work with gloves.