The page title says "Page Not Found" which would make you think it's a 404, the page body says "500 Oh, no! Something went wrong on our side." But the actual HTTP response is 200 OK.

The entire /blog section has a flash of content and then is replaced with the error message. If you view the source, you can still find the content.

Oh, but if I turn off uBlock Origin and the analytics.js and newsletter-signup.js/css are allowed to load then the page loads fine. Interesting!