I think his logic is simply based on the name. Same name, same basic uArch/Tock. eg. SandyBridge and IvyBridge, Haswell and Broadwell and now 4 chips ending with lake.
Yes, plus,
at 10nm, Cannonlake alone might not be enough to get it into stable yields for mass production the volume that Intel needs. Even now, Intel has trouble having mass availability for Broadwell and Skylake. They say something else, but I wouldn't be surprised if it was due manufacturing difficulties as well. Logic also dictates that premium parts will be the hardest to make in volume. For example, the very high frequency enthusiast oriented K parts.
It was rumored back in 2009 that 32nm might have another iteration, but good for Intel that 32nm went pretty fantastic and they were ok even on 22nm. But now, its a reality. Moore's "Law" is going on a 36+ month cycle.
I think when they get it really stable then it'll get a tock on 10nm. It likely doesn't help being manufacturable when nowadays they have to resort to rather big changes to keep transistors useful(like TriGates).