compprob237 :
Those 4 core/8 thread Ryzen APUs should be part of Ryzen 3 or 5 not 7. They should also be 2000 series since they're only Zen1+.
Oh well.
It's common to provide fewer cores on laptop parts, since people are even less likely to be utilizing tons of cores on a notebook computer, and those extra cores would likely just be reducing efficiency in most cases. It might not be as practical to deal with the heat output of significantly more cores on such a device either, at least until their notebook parts make the shift to 7nm. At the very least, it's not nearly as bad as Intel designating some of their low-power dual-core parts as "i7".
It is a little odd having both Ryzen 5 and 7 parts with 4-cores and 8-threads, though I guess they consider the differentiating factors here to be clock rates and graphics cores. More odd would be the Ryzen 3 3200U and Athlon 300U, where the differences seem to just come down to moderate differences in clock rates going by the information presented here. Again, this is something that's common on Intel's processors as well though. When it comes to notebook processors, you really need to look at more than just the name to get an idea of what the processor's capabilities are like.
As for the series naming, they likely just want all their 2019 parts to use the same naming conventions, just as all their 2018 parts went under the 2000-series, despite being a mix of 14nm Zen and 12nm Zen+ parts.