Your side promised the https://www.telerik.com/forums/font-icons-are-not-loaded-in-ie11-edge-running-on-windows-10 this forum
You have a point. While we do have our hands full with features for 2018 R2, we'll do our best to make up some time to embed the fonts."
I have created sample and load the IE browser while untrusted
font blocking enabled . Icons not loaded. i have attached the sample.