why NHzadult still on Nhz assets exchange?
this is scam assets
They are user issued, so we don't have any way of deleting assets from our end. We are developing the 'trusted assets' section for the purpose of keeping users away from those type of assets.
If I issue an asset and made a mistake doing so, is there any way to delist it?
Currently, afaik there is no way of delisting. It is displayed on blockchain forever.