[GurnBlandston]

The image near the top of the article explicitly states the previous maximum house size was 6750 sq ft, and new maximum house size for a "1-plex" is 2500 sq ft.

This is a prohibition on new big houses.

[microtherion]

You're right — there are new limitations, which I overlooked at first. But it appears those don't apply to R10 and larger lots, so it's not a complete prohibition: https://www.portland.gov/sites/default/files/2020-08/exhibit...