Many Hoverfly - Calm Panda, aka Ethan Siegel, knows his stuff, and he's one of my favorite people here when it comes to explaining cosmology. Physicists are often contemptuous of people who make bold claims that don't hold up - they're not an extremely polite bunch - so it doesn't pay to discount what Siegel says just because of his tone. Actual ad hominem arguments, on the other hand, often indicate a lack of good arguments. Here's another criticism of Wiltshire's so-called "timescape cosmology": medium.com/global-science-news/evaluating-the-extraordinary-claim-of-timescape-cosmology-superseding-the-standard-cosmological-513cd5ff6f4f