The funny thing is that the "plz delete" message have to be executed by the browser javascript. So in theory, you should be able to capture the "deleted" messages by keeping the network tab open or recording the traffic, right?

Edit: Last time I checked, ChatGPTs web interface was using server-sent events to stream the response words. The events were clearly visible in the network tab if you opened it early enough. So if it sends "delete" messages, they should show up in there.