On telegram there is "hardware market verified listings"
He is constantly posting there. I've never done any business with him and I don't know of anyone personally. Deals are good.
I usually deal with Minefarmbuy and Kaboomracks. Can vouch for both of those vendors.
Not sure which supplier you are referring to.
1. asicminersupply.com domain is even on sale
2. The Twitter account (
https://twitter.com/asicminersupply) is old and last tweeted in 2014
So which business are you talking about? Where and how did you find them?