For the record, this is how the search results look for me right now:
https://blog.codinghorror.com/thunderbolting-your-video-card/
https://discourse.codinghorror.com/t/thunderbolting-your-video-card/5157?page=2
The strange thing is that the search term isn’t present on page 2. It’s found in post 12 which belongs to page 1. So, when you land on page 2 which translates to posts 20 and onwards, you don’t find what you were looking for. That’s quite confusing for users.
And I think Google gets confused too because the blog post links to post 31 via the 
link.
When you visit https://discourse.codinghorror.com/t/thunderbolting-your-video-card/5157/31 as Google Bot you land on a page that contains post 11 up to post 31. And the canonical wrongfully points to https://discourse.codinghorror.com/t/thunderbolting-your-video-card/5157?page=2.
I think the correct fix is to show the search bot the full page that includes the linked post. For post 31 that would be page 2 starting at post 21 and ending at max 40.