[abalone]

He said it was his friend's house, not a workplace, so your theory is pretty weak.

He didn't say his IT wizard did something "like" geolocating the ISP, he said it was "almost identical" to geolocating the ISP.

Furthermore if there were some magical additional steps or wonderous circumstance that did bridge the gap between ISP-level geolocation and personal home address, he has absolutely no reason not to spell them out.

Unless he's lying.

You know, what's really fascinating about this whole thing is not why this guy would fabricate a dramatic story about him confronting a troll. That's easy to understand. It's why some people have such a powerful need to believe it. So much that they bend over backwards to find some exotic explanation around all the holes, rather than seeing them for what they are.

[prawn]

People run businesses from home. I outlined a reason someone wouldn't spell out specific details and others have written more too.

Will leave you to it, I think.