And a very weak case it is...
I love these kind of statements from gossip sites. They're so very easy to dismiss even if they sound juicy and are gefundenes fressen for the uninformed masses.
There is no such thing as "a redesign was just too much", at least not for technical reasons. There is nothing particularly hard about shrinking a design from one process to the next. I've seen cores with quite a bit of custom logic shrink from 0.25um to 110nm. It could have gone down further but the market finally wanted something different. The fact that you cross process nodes increases the effort in terms of effort, sometimes, but it doesn't become "too much". (In some cases, the effort goes down: a custom multiplier may get replaced a synthesized when your process gets faster.)
There are many very good reasons not to shrink a design, but "a shrink too much" as a technical explanation is BS. There are no reasonable explanations for it.