This cannot have been made by anyone with legibility in mind.
Small black text, straight down the middle on a colored shirt…? Come on, I’m not a designer by any means, but even I know that if you go black text on a colored background, you highlight it with some borders.
Secondly, text that small? You can go bigger. Or you make it wider, from pit to pit across the chest.
I’d be surprised if it was intentional. It’s just poorly designed, likely because whoever made it doesn’t know to use Photoshop or Gimp or such.
The sentence is fun and makes for a fun shirt print. Just needs a bit of work.