That's my reaction to the article too. I'm not sure what's exactly impressive here. I've had to find emails about a particular thing in my girlfriend's mailbox

That's my reaction to the article too. I'm not sure what's exactly impressive here. I've had to find emails about a particular thing in my girlfriend's mailbox with tens of thousands of spam emails and it takes just a few minutes. It's not like search doesn't already exist. OP evens lays out the exact methodology to follow in the prompt itself...