You can't combine runewords using this method, so you're not going to see a botd/last wish with the mods from BOTH runewords.
The item keeps the stats of the old runeword, but the runes can be replaced. EG his grief, the made a grief, pulled the runes out and remade it as an honor. it kept the grief stats, but since honor is a levle 29 runeword, that's its new req.
He probably has a way of dodging the the ith filter somehow. make a runeword, sell the runes out of the sockets like .09, but now you have to remake it into a new runeword so the server sees it as legit and doesn't delete it, so you can't fill them up with ohms and 40/15s etc