Here's the response I got from the Europe Direct Contact Centre. It's a bit cryptic - not recognizing the recent announcement and providing limited details, but they state that an entry before EES will still result in some sort of recording in EES if you depart after departure. As discussed earlier in this thread, it seems intensive to add biometric stations to all exit points.
It's early, we'll likely need to wait until we're closer to learn more.
It is important to note that while the Entry/Exit System (EES) is expected to become operational in the second half of 2024, there currently is no official start date.
Should you enter the countries using the EES before it becomes operational and leave after, then your passport will not be stamped on exit. Instead, the border guard will create a new file for you in the EES that will note the day you entered (based on the entry stamp you received) and your date of exit.