Re: "Those aren't being hit by any major restriction, right ?"
"Did you read the article? "keeping as many high-margin, high-end server chips rolling off its 14nm fabrication lines as possible, to the detriment of desktop and mobile parts". (bold mine)."
And it's worth bearing in mind that the same applies to AMD, with TMSC's 7nm fabs being fully booked as well. Things would be looking a lot worse for Intel if AMD had been able to take up all the slack.