It supports JavaScript when used as a document, but when used as an "image" by a browser (IMG tag, CSS features) JavaScript and the loading of external resources are disabled.
It's not a "goal", it's a requirement (right there in the name!). Failing to comply to a government requirement subjects you to the associated penalties. They haven't said which requirement (we assume it's Russia Sanctions, of course), but their lawyers must have determined that the penalties would apply to them.