Per my tests, the WCO still relies on the PIR to wake up. The Detection Zone is supplemental, as described.
The big email announcement implies that the Detection Zone will help improve detection range. The algorithm was already continuing to check for motion across the entire area, once woke up.
Bottom line, motion outside the PIR area will not wake up the camera.
“Your Wyze Cam Outdoor still uses a passive infrared light (PIR) sensor to detect motion from anything that emits heat. With Motion Detection Zones enabled, Wyze Cam Outdoor will use a pixel comparison algorithm afterwards to verify that the motion is happening within a specific area.”