Did you even read further on? The section right after that addresses the step changes in current frontier models https://github.com/humanlayer/advanced-context-engineering-f...
This part of your comment is confusing.
The article talks about agents past this period. Yet it seems like you’re saying this article isn’t relevant because it doesn’t?
> just writes off any improvement
Is not what that section contains?
There's a more nuanced point about capabilities improving in some ways but not others (ability to one-shot apps vs. maintenance of existing code over time).