It's not about duckdb's performance improvements per se, it's about the change to the aws instance type they're using to get fairer benchmark results by avoiding block storage and preventing noisy neighbors.
"The team at DuckDB Labs has been hard at work improving the performance of the out-of-core hash aggregates and joins."
Aside from that, since April DuckDB has vastly improved performance of a number of queries, including aggregates, joins, window functions. [0]
[0] https://duckdb.org/2023/09/26/announcing-duckdb-090.html#cor...
> please use the original title, unless it is misleading or linkbait; don't editorialize.
Just because they mention X in the article, doesn't mean you should change the title to X, even if X is nice, welcome news.
(Submitted title was "DuckDB performance improvements with the latest release")