They NEVER delete ANY video, just hide your access away. I had some footages way back in 2019 that I could still access, so long as I have the video's uuid.
They also made several updates to reduce image quality (added fake motion blur). The goal I guess was to 'enhance' privacy of passer by but in reality it also means unless the person of interest stands still facing the camera, the footage is worthless as a CCTV device. It's jarring to see crystal clear videos from 2019 vs the blurry mess that is today. I replaced the front door one with an Eufy, it has its own problem but at least it's not a complete POS like the Ring products.