I doubt that's accurate at all. According to them, all the remaining season 1 episodes are dropping on December 31st. None of the Trek shows drop the whole season (or half season) on the same day, and even ignoring that, December 31st is a Saturday and since fall 2018 Thursday has been the day for new Star Trek episodes.
Also, looking over the other shows on MA, they say all of Lower Decks season 3 is dropping on December 31st, meanwhile they claim all of Picard season 3 and SNW season 2 will be dropping on December 31st of 2023. Which we know is inaccurate since Picard season 3 at least has already been announced for a February 2023 premiere. I suspect December 31st might just be a default placeholder MA uses if there is no premiere date announced, and they apply the appropriate year to that date.
Don't know why they can't just not put any airdate in at all until one is announced. Especially since that is exactly what they are doing in regards to Disco season 5. But who really understands MA's thought process on anything?