The series was one that got an English dub release from Nozomi when it first came out and the trailer works off of those materials to gain a bit of additional interest.
Originally airing in the summer 2004 season, the English dub was produced by NYAV Post with Mar Diraison and Michael Sinterniklaas directing.
Check out our review of the 2013 compiled release of the series here as well as our Ten Years Later retrospective!