Now, if a spell or ability you play gives an opponent a choice, you must get confirmation from them that they aren’t doing the optional thing.
Apply to the case of me controlling The Tabernacle at Pendrell Vale and my opponent taking his or her turn and not acknowledging the trigger to keep a creature they control and simply going to Draw Step and drawing a card? In other words, would I need to remind them they have a choice in their upkeep, since I control Tabernacle, or not since Tabernacle gives the ability to their creature and so they control the trigger?
It's a little confusing because the ability of my Tabernacle gave them an ability that gave them a choice. Which is different than just giving them a choice, but certainly (at least to me) against what would seem to be the idea of the above change to the communication rules. It might just be a case of the rules simply not being meant to cover such a (sort of) convoluted case where abilities are granted to other's permanents.