Let me answer generally first.
I don't believe they would be. Any of the 22 suspensions can only be reinstated by consensus of all CPTPP parties.
Even in the event that the United States decided that it was interested in returning to the agreement, those suspensions, including the patent term extension, would not automatically be lifted. They can only be lifted if all parties agree to it.
No, there is no retroactivity applied—only at the entry into force.