If it's authorities, they're really set on catching someone with dmt... The ad was re-posted several times since yesterday, and the guy is advertising it as 'the spirit molecule' and 'divine moments of thought', no less.
However, most people out there have no idea about what dmt is or its legal status, so I don't think setting this sort of trap would be worth it for the authorities. It's probably just a pusher trying to exploit a niche market. Not particularly bright either, seeing how enabling random people (used to and seeking party drugs) to have the sort of experience induced by dmt can lead to very unpredictable outcomes. This same guy previously advertised salvia, known for inducing bad trips in many people, as 'a must try'.