I thought the point of the article was pretty clear -- to tell you that EnterpriseDB, something based on a popular open source package, exists and a little about it.
But you seem to be asking about the point of EnterpriseDB. That too is pretty explicit in Paragraph 3: Enterprise DB compatibility and a GUI Studio application. It also mentions the product being cheap.
While some may think neither of these is important, I know lots of people do. Being able to migrate an application from Oracle to something cheaper seems to be a very useful thing, and apparently that isn't as feasible with PostgreSQL.
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