The Shadow Hills 'Green' as its now called was released as exclusive on UAD platform like 3 years ago so its per se not new. Having said that I agree that having it available natively at PA should have been the new improved offering from the start, but, you know, PA have their priorities and are not short on frustrating their loyal customer base.
To me the upgrade cost was too high, should've been half of that. Its likely that they are again just trying to get people to reason that its better to buy the Mega subscription they so desperately want to push.