If there are NDA's in place, would they not also prevent 3rd parties from making such announcements?

Perhaps POET wants it this way. It will pack a double wallop to follow up their releases (which do not need to mention the name of the vendor who is making their new tech possible) with their own releases that announce POET's working partnership(s) with all of these vendors. Perhaps POET has reserved the right to break the seal on the NDA, per the terms therein?