https://en.wikipedia.org/wiki/QUEL_query_languages
QUEL is a better language (more consistent), and SQL won not on technical grounds, but because Larry Ellison is a better salesman than Michael Stonebraker.
Your post is wholly based on time travel (~"nosql predates sql") and introduces a completely alternative evolution of database design in which quel never happened and we go "full circle" to the nosql-that-was-prior-to-sql.
Which is not to say that the poster wasn't wrong about their claim, but it's not invalid to make said claim in casual English in the particular way you're implying.
Though, also, in the more general case, "NoSQL" databases did certainly exist at the time Postgres was conceived (Postgres just wasn't one of them.) Navigational databases like IBM IMS were what we'd call "a NoSQL database" if they were conceived today.
Back in the early days PostgreSQL was a NoSQL database called Postgres, using a query language called POSTQUEL.
Then SQL was added, becoming PostgreSQL.
With Agens Graph adding an optional non-SQL query language back to it, it seems like it's gone a full circle. Hopefully on an upward slope though. :)
If anyone's interested in the pre-SQL Postgres, there's some info here: https://www.postgresql.org/about/history/