Note that although this is an awesome exhibition of teams, most of these clears cannot be replicated and require RNG so extreme that they are effectively unviable. A more detailed breakdown of each team shows that each of these runs simply can't be done without significant luck when it comes to enemy spawns, as there are a variety of enemies that will hard counter any of these teams (and the dungeon is no-continue, so no stoning!). Even assuming you manage to avoid the major team-killers such as Hera or Sopdet, the existence of Kali on the 20th floor is a hard counter to the vast majority of builds.
For those who are unaware, the 20F Kali can be either light or dark, and has 30 million HP (no, that's not an extra zero. That is literally 30 million). Not only that, she double pre-empts turn one with a 999 turn status shield and a 50% all damage reduction shield...then requires you to hit her below 65% in one turn, or will otherwise OHKO you with a 120k damage hit.
This means that in order to defeat her, you are required to do a minimum of 21,077,778 damage in one turn in order to win. This is a hard DPS check unless you bring gravities.
Below is a breakdown of each team, and the reason they were able to clear:
Ult-Ult-Evo Sakuya - is actually able to bypass her DPS check entirely due to double leader gravities. She's actually the most consistent 20f team in this entire showcase, though she requires extreme RNG in all previous floors in order to navigate past the various binds and boardchangers that can instantly end a run if they spawn.
Awoken Ra - has the most "reliable" ability to clear this dungeon outside of Awoken Anubis, but is still subject to a hard RNG roll of 50/50 on 20f as he can only pass Kali's damage check if Dark Kali spawns. Without the 2x elemental advantage, this team doesn't do enough damage to survive. Not even Indra's damage shield is severe enough to prevent a OHKO from LKali
Awoken Anubis - is the only "reliable" team in the game that can run this dungeon, though note that "reliable" is in quotes because he is in no way actually reliable. Although Anubis has the best ability to tackle the dungeon and deal with bad enemy spawns, the fact remains that you are required to hit a minimum of 11-12 combo on multiple floors without previous setup, which is simply impossible without significant skyfall luck. On the bright side, he is not hard-gated by this dungeon, meaning you can clear as long as the skyfall gods are on your side