Read some of the articles about it here -

https://duckduckgo.com/?q=dgrim+reaper+at+coronation&ia=web

They all have the same lighthearted "Oh wasn't that crazy?" tone. Reminds me exactly of V for Vendetta when the talking heads comment on why the Old Bailey was blown up. Whatever this meant it is the exact opposite of what they are saying.

Post on 4chan dug deep into it. Did not memorize the minutiae but it's straight up Masonic symbolism.