Probably just to avoid confusion like @Wow has stated. Calling them Non-Combat pets will ensure that people will know that they do not aid in combat rather than just calling them pets where they could be confused with Sorc pets in the tool-tips for sets.
There was a thread on here a few weeks ago, someone had sorted their gear and bought a crown store pet I think expecting Necropotence or Eternal Hunt to work with it, and were narked it didn't.. So maybe a response to that.
Xbox One | EU | EP
Beardimus : VR16 Dunmer MagSorc [RIP MagDW 2015-2018]
Emperor of Sotha Sil 02-2018 & Sheogorath 05-2019
1st Emperor of Ravenwatch
Alts - - for the Lolz
Archimus : Bosmer Thief / Archer / Werewolf
Orcimus : Fat drunk Orc battlefield 1st aider
Scalimus - Argonian Sorc Healer / Pet master
Fighting small scale with : The SAXON Guild
Fighting with [PvP] : The Undaunted Wolves
Trading Guilds : TradersOfNirn | FourSquareTraders
Xbox One | NA | EP
Bëardimus : L43 Dunmer Magsorc / BG
Heals-With-Pets : VR16 Argonian Sorc PvP / BG Healer
Nordimus : VR16 Stamsorc
Beardimus le 13iem : L30 Dunmer Magsorc Icereach