I see this as well; it's confusion over
appositives.
An appositive is a noun or pronoun — often with modifiers — set beside another noun or pronoun to explain or identify it.
In some cases, the noun being explained is too general without the appositive; the information is essential to the meaning of the sentence. When this is the case, do not place commas around the appositive; just leave it alone. If the sentence would be clear and complete without the appositive, then commas are necessary; place one before and one after the appositive.
I wouldn't use commas in either of your examples. But I would use commas like this:
X Corporation President Joe Smith, a graduate of the Harvard School of Business, addressed shareholders.
A new cookbook by Chef Jamie Oliver, a Food Network favorite, is now available.

I haven't seen that yet.