Well, there's a couple of ways to take that statement. It could mean that the CPU isn't as limiting
relative to the GPU for the Switch as that is for the PS4/XB1, or it could mean that the Switch will overall have a better CPU than the PS4/XB1.
For the former, I think this is definitely a given, even if we just wind up with 4 A57s. For the latter, it will certainly depend on the number, type and clocks of the cores, but it's definitely possible (and likely even-
see here) for the Switch CPU to be ahead of the PS4/XB1 in at least certain ways, if not every way.
Now, what would the latter interpretation mean for games? For ports I doubt we'll see much of a difference. It might allow games to reach a higher framerate due to improved physics/AI/weather/collision/etc. processing, which could take some of the load off of the relatively underpowered GPU. Meaning, a developer could get a theoretical 60fps PS4 game up to 70fps when scaling down the GPU functions (resolution, particles, shadows, etc.) which could then let them scale some of those features back up a bit to reach 60fps again. **All hypothetical, and I'm not an expert but from what I know about game development it seems possible**
For something like BotW which manages some pretty complex CPU functions on a very limited machine in the Wii U, I could easily see the Switch CPU bumping that framerate up substantially, before we even talk about the 3-4x improved GPU or the 4x more RAM.