Define 'subsidiary'
So it still comes down to the definition of a subsidiary under the terms of the cross license agreement and whether GLOBALFOUNDRIES qualifies.
For the record, here's the full text of clause 1.22 of the redacted version of the agreement, which is the only one that's publicly available:
AMD owns 50 percent of the voting shares of GLOBALFOUNDRIES but only owns 34.2 percent of it on a fully converted to common shares basis. According to the above clause, it seems to qualify as a subsidiary under point (b), but it's not so clear if it does under point (a).
We have to assume that AMD is in no doubt about point (a), otherwise the formation of GLOBALFOUNDRIES would have been a gigantic, high-stakes bluff.