What's really funny about this comment is that, while all of the features discussed in TFA are fully standards-compliant SQL, MySQL implements none of them, and its "upsert" isn't.
EDIT: And before one slags PostgreSQL too hard for not currently supporting upsert, one might peruse the relevant pg wiki page [1] to better understand where development stands and why we don't yet have it. (Hint: it's actually kinda complicated, assuming you want it done, you know, "right".)