Interesting, I have been told this before by a tinter...

http://aawtint.blogspot.co.uk/2012/04/fact...t.html?m=1 MY14 Kahn Converted Dynamic - Fuji White Ebony/Pimento Interior
MY15 Xenon Headlight Conversion

MY17 RRS SVR - Estoril Blue Cirrus/Ebony 🪣💺’s

Even the standard glass in my FL2 stops my reactolite/reactions glasses from darkening in sunlight so I'm pretty sure that some UV is filtered out.

AFAIK, even untinted glass stops some UV wavelengths so will lessen the effects but not prevent exposure completely. 2013 RR Evoque Pure Tech
2012 TD4 GS Auto Orkney Grey - gone

Standard glass stops most UVA - hence 'reaction' lenses not tinting and your skin not 'burning' when in the car on sunny days. However......
My understanding though is that standard glass wont stop UVB. So skin damage still takes place underneath even though you don't have classic sunburn' symptoms of red peeling skin.

However I am not sure if tinting stops UVB. (Coming) 2016 RR Evoque td4 180 HSE Dynamc
(Going) 2013 TD4 GS Auto - Santorini Black with black leather. Cold Climate, UK Lighting & Armrest Packs. Privacy Glass. LR Rubber Mats. Full size spare.
60 000 miles averaging 35mpg

(Gone) 2010 TD4 Manual GS - Stornoway Grey. Sold at 3yrs old & 64k miles. Final average consumption 39.2mpg.