But muh neutral environment
It's from over a month ago. Things may have changed since then. It's just that it's the most recent poll we have of this race.
In fact, it may very well still suggest a neutral environment. In a neutral environment party considerations likely matter less and with Ronchetti being a purportedly good candidate and Lujan Grisham (from last I saw) never being in a position better than slightly above water with her approvals, this kind of checks out. If it were a Republican wave environment Ronchetti would be leading, and in a Democratic environment Lujan Grisham would probably be well-ahead. Of course, gubernatorial elections also tend to be more separated from the national environment anyway. Baker, Hogan, and Scott winning overwhelmingly in 2018 didn't negate that year's Democratic wave; and Lamont barely winning in Connecticut didn't either.