“[…] far-UVC light cannot penetrate even the outer (non living) layers of human skin or eye; ” Without reading their previous reference, this doesn't make sens

“[…] far-UVC light cannot penetrate even the outer (non living) layers of human skin or eye; ” Without reading their previous reference, this doesn't make sense. If it doesn't reach the outer layers, what’s blocking the light? Also, I seriously doubt this wont cause cataracts in the long term. By Wiki, light < 200 nm is absorbed by O2. The light proposed by the authors is 207< \lambda < 222, so about as energetic as UV can be and not be blocked by the atmosphere. Ill take their word that it cant make it past the layer of dead skin. But what protects the cornea? Just the very thin layer of tears? Turn up the HVAC air exchange rate please! There are many other benefits to that.