I've had a good dig around for 'Nazi Death Star, and can't find a consistent season or episode for it. However, with a bit of deduction, it does seem to be an episode.
Looking at the air dates, it looks like the Science Channel transmitted new episodes of Season 3 on Tuesdays, and Specials were transmitted on Saturdays. Which confirms that 'Twisted Relics' is a special, but would also mean 'Nazi Death Star' was a regular episode (transmitted on Tuesday, 11/27/2018), after 'S03E07 The Town That Disappeared' on Tuesday, 11/20/2018, and before 'S03E08 The Real Shawshank' on Tuesday, 12/04/2018.
This contradicts the episode list on the Science Channel web site, which does not include 'Nazi Death Star' in any of the seasons. I'm beginning to think this is an omission on their part.
If I were to renumber the episodes in chronological order, we'd have:
S03E07 The Town That Disappeared' (11/20/2018)
S03E08 'Nazi Death Star' (11/27/2018)
S03E09 'The Real Shawshank' (12/04/2018).
S03E10 'Secrets of Alien Stonehenge' (12/11/2018)
Even though I have yet to find an official source that corroborates that list, the air dates and day-of-week transmitted all points to that being the 'correct' sequence, despite what the Science Channel has in their 'full episodes' list.
So I'll go ahead and renumber as above, unless that is an issue? most of the sources I've looked at corroborate the other seasons, it's just season 3 that seems to be 'missing' this episode.