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I cant believe how often that BS has been posted and debunked, yet keeps being sprouted.
AM is selling unregistered securities to (unsophisticated) US investors, and therefore subject to SEC regulation, no matter where they are located.  Same goes for EU regulations and investors, Japanese, and basically.. everywhere else.

And so Id say yes, its highly likely AM was among the targeted companies offering securities on directly on bitcointalk:
http://cointelegraph.com/news/112811/us-regulators-one-two-punch-sec-probes-crowdsales-fincen-takes-aim-at-exchanges

The letters are being sent out to companies performing offerings on Counterparty, Cryptostocks, companies hosting offerings with colored coins, and companies who have performed unregistered securities offerings via Bitcoin Talk. In all cases, the SEC is employing a team of researchers to track down the people or companies behind each offering via forum messages, domain registration information, transfers of funds via exchanges and other means.