Alright.
I've been following paathurnax55 for about 8 minutes, and he's seemed to get about 12 diamonds in that time.
I xchecked him, and got more suspicious about it.
So I followed him. In basically pitch dark, he was mining in bedrock layer, searching randomly for ores.
Here are more screenshots.
Btw, I think there was a potential spam going to happen, but didn't.