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I'm using material icons outlined. when I go to publish, I get the warning "material icon outlined.woff" is not a web-safe file name! Am I doing something wrong?

This is due to the fact that the font files for Material Icons Outlined contains spaces in the file name. You should be ok but only Pablo can change this.

would this mean that, i will only be able to use the icon set after pablo fixes? lol

No. It should still work. I've used it.

so just disregard the warning message? or are you doing something as a workaround?

No work around. Typically files names should not contain spaces. Even if they do it still will most likely work but there could be a slim chance where it won't. You should be good.