To be 100% honest it's a sales ploy, something new, a newer version perhaps, an "upgrade" so it's different, maybe the tube looks different, with different machine markings, or maybe the endcaps are threaded to "market" it serviceable. I had 2 separate Elk hunters here (2 weeks ago) who were uninformed regarding their suppressor purchase and were quite frustrated to say the least, that they were having to clean their cans every 100 rounds in order to break it apart consistently... I just laughed, they didn't know any better, I ended up selling them an SRT Shadow XL Ti, and a TBAC Ultra 7, both of which are some of the best I've used and are not user serviceable, AND both companies have been around a long time with a lot of knowledge about Suppressors.
NOTE: I am talking about center fire suppressors, not rimfire, or cans that see a high volume of consistent subsonic rounds.