Strength of evidence and missing benchmarks
Well, TPC-H is more about warehousing type of queries, it is no TPC-C, and I believe the article tells only one half of the story, that about CPU use optimisation. The other half is columnwise data storage, and that helps optimise I/O.
Standard Postgres does not have column storage, so it would fare no better than Oracle, but its derivatives Netezza and Greenplum just might. Then again, Sybase IQ is on the list, with rather unimpressive results.
Also, it would be interesting to see how the CWI's own column store database MonetDB performs.