As I found the article did a poor job of demonstrating what a swift brick is, https://en.wikipedia.org/wiki/Swift_brick
Literally right below the title:
> bricks that provide nesting for swifts and other endangered birds
And a picture.
The article does, in fact, do a perfectly fine job of explaining what a swift brick is. GP could easily have said “I couldn’t quite picture what a swift brick is”, but instead said “article did a poor job explaining swift bricks”, and that’s what they’re getting criticised for.