It looks like they changed the Geometry so that the Primer and Rootdown are not the same unless they are going to update the Primers Geometry to match the new Rootdown numbers.
Looks like you're on an archived page or something. That's the old geometry for the Rootdown.
Funny thing is that I got an early 2020 Primer and the front triangle had the 2020 geometry and the rear triangle had the shorter 2019 chainstays. I thought it could have been a measuring error but compared it to a friends 2020 Rootdown and I had 5mm shorter stays. And I must say it is awesome and should be the standard geo.