I apply everything I learn on my blog (and my other sites most especially). Of course, doing seo on a site means applying a lot of seo techniques, one of which is the use of LSI. With all those seo elements applied, I cannot exactly say that one particular element is the key to the site’s rise in the serps. I suppose, it’s more likely that the aggregate effect of all the seo elements (off-page seo, on-page seo, etc) made the serp improvement possible. But yes, in general I’ve become more confident and I indeed see improvements in my sites performance.