Justin,
Thanks for resurrecting the thread. I was just having this conversation with someone yesterday and was about to reengage, but you beat me to it. So, maybe a little my fault for getting this thread off course earlier with the action figures, but I believe LFL has had no problem marketing the Remnant character. As of this post, we now have a black series figure, two vintage collection versions and a sideshow collectibles sixth scale figure. Yes, Hasbro and Sideshow are independent companies, but it shows that the blessing was given by LFL for the naming of this character.
The rest of my reasoning is pulled from anthology films and Disney+ features because there's screen references and that's what we need. Post-Endor and Post-Civil War Remnants have been covered extensively in both Canon and Legend writings. Please refer to these references for additional information: https://starwars.fandom.com/wiki/Imperial_remnants
I thought I pointed this out earlier, but neglected to actually do so. In Chapter 15 "The Believer," Mayfield and Cara Dune have a very specific conversation in which Mayfield states "these Remnant bases are set up by ex ISB." Cara then goes on to state "you sure do know a lot about Imperial Remnants." This exchange, along with the figures and visual references from this episode and the ones in Season 1 solidify the idea of Imperial Remnants as their own established character/ faction in the Star Wars universe and New Republic era.
Next, after seeing Moff Gideon's forces in season 1 and then the seizure of the Imperial Gozanti Freighter in Chapter 11 "The Heiress," as well as the revelation of Grand Admiral Thrawn's existence at the end of Chapter 13 "The Jedi," we've also got an abundance of 'healthy' (shiny white) Imperial forces who appear to be disconnected from the Remnant factions... AND ALL WEARING ROTK ARMOR! We don't know anything about Thrawn's forces other than what we assume were annihilated in Rebels, but now we can expect to see these guys make an appearance in season 3. Thrawn sounds like he's alive and well. These instances as well as every other occurance of ROTK armor in Anthology projects is why I wholeheartedly believe the name should be changed from ROTK to New Generation Stormtrooper. This also opens the door for new weapons and accessories used on screen including the SE-14R.
So, with that said, The Remnant Stormtrooper appears to have ROTK armor, heavily weathered/ damaged an OT Helmet, and a plethora of different weapons. I'll look for the reference photos I haven't posted.