I keep finding that Google keeps getting worse at these types of queries. I wonder what kind of metrics would incentivize Google to be better at finding these.

Here's another example - https://hackaday.com/2018/12/22/clever-wedges-that-will-incr...

Try to find this article without filtering for hackaday domain and not using the exact title. tl;dr of article - these are triangle / wedge shaped stencil holes for SMD surface mount soldering on square / rectangular pads.