According to the Hungarian site HWSW, here's what they are saying.
https://www.hwsw.hu/hirek/57865/int...ade-lake-cannon-lake-ice-lake-tiger-lake.html
Server
Mid 2018 - Cascade Lake on 14nm++
Mid 2019 - Icelake on 10nm+
Mid 2020 - Sapphire Rapids on 10nm++
Client
Early 2018 - Cannonlake on 10nm
Early 2019 - Icelake on 10nm+
Early 2020 - Tigerlake on 10nm++
Early 2021 - Sapphire Rapids on 7nm
Since this article is dated few months ago in late September of this year, we can peg Ashraf's information as newer.
"Alder Lake" in light of this does not bode well for Intel's 7nm development. The naming of Lakes must have some reasoning behind it. Alder Lake might be yet another 10nm client CPU, possibly in Early 2021.
While the platform might change greatly in Icelake, the core might not be a fresh new one. It'll be an extension, possibly for 7-10% gain.