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I thought this too but @crokkon thinks not. I have been more hf20 leaning just in case. At the end of the day, it is a week difference.

To my understanding, the vote rshares & weights are calculated at voting time with the HF active at that time. This means that posts which pay out in HF20 may have some votes done (and calculated) with HF19 rules and others with HF20 rules. So the 30->15 min change only applied once the HF went live, but the curator share remaining in the pool on payout applies to posts up to a week back.

vote rshares & weights are calculated at voting time

Yes, but none of that is changing. The early voting penalty never changed the rshares given from a vote, and isn't going to now. It's all calculated at payout time.

no, the vote weights depend on the rshares and include the reverse auction system. Apart from the VP->mana change, the rshares got a -50M downshift with HF20. So both of them were changing, and both are calculated at voting time. The only thing happening on payout is the distribution of rewards based on the sum of these rshares wrt. the recent claims (author) and the weights wrt. to the total weight (curators). On payout, only the distribution of unclaimed rewards changed with HF20.