This is just false. The web-font icon, if tagged with aria-hidden="true" (as suggested on the accessibility page) will not be read by any modern screen readers

This is just false. The web-font icon, if tagged with aria-hidden="true" (as suggested on the accessibility page) will not be read by any modern screen readers. Additionally, if the web-font icon is representing meaningful information the span with a class of "sr-only" allows you to represent the icon in a meaningful way to users requiring a screen reader. Please, read the accessibility page that has been linked to you. You're saying things that are flatly untrue.