Absolutely not, the node that Skylake used wasn't absolutely good enough to offer higher core counts at good frequency/thermal performance. See Skylake HEDT for confirmation and see how a same core count part performs with 9th gen despite their microarchitecture being fundamentally the same.
The fabs have been optimized too in these years it's not like they were idling around on that sector, which has shown to to be a double edged sword too because now with 14nm++++++++++++++ they can make chips with crazy frequencies that can't be met by 10nm just yet, if the node was the same as the one used in Skylake or even Kaby Lake then their current 10nm(+?) would have been more than enough to replace it.
I don't believe they will get those frequencies on 10nm, they will move to 7nm before that. Betting on 10nm for so long was a big mistake.
Also you could get higher core counts on skylake they just didn't bother to make it viable for non Hedt parts, they milked it as much as they could and they were caught completely off guard, as said above, they didn't believe that the zen core could bring such an improvement over their last design.
This attitude is not exclusive to Intel, every company with a monopoly does this kind of crappy tactics, 0 innovation for their costumers only minor improvements.
