Basically, what he's saying is that the Democrats current lead in the generic ballot is small and not getting larger. It's been stagnant, unlike 2017, when it kept growing.
A three point lead may not be large enough for Democrats to gain seats, especially when you take into account redistricting, and even worse, the SCOTUS eliminating the voting rights act. Republicans could end up gaining a significant number of seats,which would be catastrophic.
https://www.aol.com/news/cnn-analyst-harry-enten-lays-212819552.html
Any agreement here? This is frightening.