Any articles coming from a company which describes itself as "The Postgres Database Company" and sells "a relational database management system based on PostgreSQL..." [1][2] stating than "PostgreSQL outperforms X" is de facto suspicious.
Why does that make this article suspicious? Obviously they stand to benefit from more people using PostgreSQL, but they've been exceedingly clear with their methodology - their benchmark is available on Github: https://github.com/EnterpriseDB/pg_nosql_benchmark.