There are many snail powder shops in Nanning, because snail powder itself originated in Liuzhou, which is also one of the big cities in Guangxi. Nanning is more than 300 kilometers away from Liuzhou, which is very close. So there are also many snail powder shops in Nanning.

However, the snail powder shop you mentioned seems not to be found in ASEAN, but it seems to be found in the takeaway, located in ASEAN commercial street. I haven't looked for it. Go and have a look sometime.