We have some mobile-friendly issues affecting `/domains/.well-known/`

This page simply displays:

> Index of /domains/.well-known<br>
> Parent Directory (a link)<br>
> pki-validation/ (a link)

Do the mobility issues for this page affect the site overall? i.e. will there be any penalty that affects the site, or is the penalty applied to the page only?

Should I add this page to the blocked pages in robots.txt?