Additionally touting the slim block submission as some technical advantage when all it leads to is every single miner starting to mine empty unverified blocks on every block change is a significant step backwards.
If you are going to (try to) rebut the article, how about you actually rebut what it contains? There are exactly zero mentions of 'slim block submission' in the article. Do try to keep up - I don't think you have any idea what Xthin is.
Apologies for not being explicit then: The combination of "Xthin" "Expedited Relay" and "Optimistic mining" that BU explicitly is pushing since you want to be pedantic about terminology, and he links the articles that describe it himself, so I'm rebutting not only what's in the article, but his own linked articles within it.