By your analogy they already did with 10nm. ( And arguably 14nm )
It's one thing to have been wrong (even carelessly) about 10nm (more than once). It's another to say that a company officer would intentionally lie (to a group of professional investors no less)
If that wasn't lying, I don't know what is.
You will have to look back at every single statement in their pubic and investor meeting to judge wether they were intentionally lying about 10nm. To me, they were.