My mention of necros talking about doing hs refers to posts I've seen over years. I don't remember forum names.
As far as seeing only dead chanters in South/east? Just look at he SAC thread. Or
this thread where I checked logs for my named kills maybe. I think it's about to the point of common knowledge among most people on p99 that chanters can solo spots like this, and that's because like a score of chanters or more have farmed in there over the last few years.
If necros are doing it, it's only a tiny fraction as often, and it was never discussed on the forums in any detail. And it's not for a lack of invitation. God knows I've posted in SAC thread and elsewhere asking for a necro to do south and stream it or do the SAC kills or whatever.