Although I was aware of the project Mercury I hadn't realised that they had performed ACCT txs months ago, however, it should be noted that these were only on "testnets" (Bitcoin and Dogecoin apparently) whereas the ACCT done using AT just recently was done using two "mainnets" (Burst and Qora).

IMO anything done on a "testnet" doesn't really count but perhaps that is just me.

We will correct our media release to clarify this - the work that the Mercury project was based upon (from @TierNolan) is also key to the design of the ACCT for AT (although it doesn't work exactly the same due to the fact that ATs act as escrow accounts) and in the ACCT documentation http://ciyam.org/at/at_atomic.html you'll note that TierNolan was duly credited (and that has been in the docco for months).