I own an archangel as well. If I remember correctly, I was in the 2nd shipment, so mine was very early on. It has the really light engraving (I've seen some with heavy engraving, which came later). It was also before they came out with the brake attachment option.....which honestly, I kinda wished mine had....but mine had already shipped before they came out with that.
I almost swear that it was originally advertised as a serviceable suppressor, but I am like you and could never figure out how to take it apart.
That being said, I've never felt the need to do so other than simply for curiosity. I have well over 1,000 rounds through mine and I see no real reason to take it apart. I am very pleased with its performance and it was a steal for just over $600.
I cannot believe that someone is just now getting their group buy suppressor.