Icon Tokens is not an asset you should depend on.It is a documented pattern for implementing SVG icons in OutSystems correctly.
You are encouraged to:
copy the approach
adapt it to your design system
own the CSS and icons in your application
This guide exists to show how to do icons well in OutSystems, not to introduce another runtime dependency.
If you're interested in understanding how this works, I advise you to read this great article by Rik Schennink.
Note: To this date, the only limitation I am aware of is with multi colored icons. If you have that use case, this approach won't work.