*** DISCLAIMER: Speculation ahead. Get caffeine. ***
Given the current climate by a quantity that I suspect is fewer than what they're labeled as being but I've not made any tallies, I would not be surprised if the scene was a 4th wall break and playing into the Chameleon Arch thing. On one hand it's entertaining, given the precedent set in that 10th Doctor story and put to novel and arguably effective use in "Fugitive of the Judoon". I hope the finale is more brilliant than bunk but either which way, Jo Martin is a Doctor I do want to see again. (and Jodie's had a lot more dialogue worth praising in series 12. Not all the scripts are great, but some definitely were. "Spyfall" was one example, even with the silly laser shoes scene. I do wonder if the Kashyyyykkkkk things, which had a vague outlined visage not unlike Cybermen (as what everyone was not wrongly saying), really were Cybermen gone nutters and are the cause of the Cyber army to eradicate humanity with. But a time travel void would be as very powerful tool, more than a teleporter that can traverse entire galaxies. Add in Doctor Ruth, who had a too-similar teleportation effect and the Master continually harping how everything's a lie...)
But like a certain Walrus song, some scenes are made for the sake of those that look for meaning where none exists.
Either way, I just hope the 14th Doctor is Jo. She rocked the house. And had the better looking TARDIS set too. It's a ship, not Harry Potter's spouse on the great space coaster that always ends back at Earth.