The blog post in question is about how at least some string theorists think that string theory has been proven true, in spite of the fact that no one knows how

The blog post in question is about how at least some string theorists think that string theory has been proven true, in spite of the fact that no one knows how to test it empirically. The post includes a link to an article that argues against this https://www.nature.com/news/scientific-method-defend-the-integrity-of-physics-1.16535 https://www.nature.com/news/scientific-method-defend-the-int... So yes, they would like it if there were practical tests, but no, they don't think they are necessary.