What's with the delay on the Zac changes?

The Zac revert has allegedly been confirmed for Patch 9.10, however it's currently day 3 on the PBE cycle. What's with the delay?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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