I am getting this message from PageSpeed Insights:

Ensure text remains visible during webfont load

That font flagging is coming from this plugin stylesheet:

https://www.usacarry.com/wp-content/plugins/wpdiscuz/themes/default/style.css

I'm using Perfmatters with the Display Swap option turned on but their support said the display swap would have to be added on WPDiscuz's end, as they aren't able to change the font face inside that plugin stylesheet.

Does anyone know a fix for this?