Unfinished special effects are what stopped both The Walking Dead and Supernatural from airing episodes despite concluded filming; The Mandalorian evidently has more remote capabilities thanks to Lucasfilm and ILM.
He also revealed that it’s thanks to Lucasfilm and ILM (Industrial Light & Magic) that the footage for Season 2 can be completed remotely, effects and all.
According to Jon Favreau at the ATX TV Festival (via ComicBook.com), The Mandalorian did indeed finish photography before the production halts throughout the entertainment industry, so reports that filming had completed proved to be accurate.