[I guess that must be a useful market niche though, apparently this is by a company selling batch compute on exactly those small open weights models.]
The problem is the author is evaluating by dividing the Artificial Analysis score by a blended cost per token, but most tasks have an intelligence "floor" below which it doesn't matter how cheap something is, it will never succeed. And when you strip out the very high results from super cheap 4B OSS models the rest are significantly outclassed by Flash 2.0 (not on his chart but still worth considering) and 2.5, not to mention other models that might be better in domain specific tasks like grok-3 mini for code.
(Nobody should be using Haiku in 2025. The OpenAI mini models are not as bad as Haiku in p/p and maybe there is a use case for prefering one over Flash but if so I don't know what it is.)