So untrue that I actually had to spend time correcting this on a project already to avoid your massive CSS bloat and to properly support someone's reader. World class, indeed.
The difference between using a web font and using SVG is primarily that you do not break the underlying assumptions of usability software, primarily one that a font contains actual information to be parsed. An SVG icon is not going to cause a screen reader to say 'Unpronounceable'. A web font is going to do this. Among other things.
I think this is utterly irresponsible and disrespectful to charge for the SVG icon set like this since it only harms usability and disabled users, which is the main reason people are migrating away from icon fonts in the first place.