SirZelmer promised to sell 20 mil Sia in two parts. When I sent payment for the first part, he went offline and never answered. Later, he reconnected with his alt account AgeofCrypto and tried to "sell" me more Sia.
You can tell their connection from their posting history.
AgeofCrypto posts about the same coins, only has a few posts, and left positive feedback for SirZelmer.
SirZelmer and AgeofCrypto also posted exactly the same ad for "20 mil Siacoin" in the same thread. They are the same person.
The other person that left a trust rating for SirZelmer could also be connected, but I want to research his account more before making any accusation.
What's for sure is that SirZelmer and AgeofCrypto are the same person, and that person is a scammer.