I started with a quick skim of his piece.

I quit at "Why no one has “noticed” the ONS “smoking gun” before (because it doesn’t show higher mortality):"

According to the OECD every country it tracks is showing excess mortality. This by itself is enough to convince me that Brian Mowery is just another tool in the propaganda toolbox.

https://www.oecd.org/coronavirus/en/data-insights/excess-mortality-since-january-2020