Me too. Gonna give this technique a go this month. Probably try a photo rig w DSLR tethered to PC and mounted over a tilted drawing board vs vertical whiteboard…. so it (the whiteboard physical camera/lighting setup) can be reproduced like a copy stand. And be available for think segments frequently. Starts with a good script of course.
Will be checking in to see if anyone else has more details about their technique for this. I noted in the “23-1/2 hours” clip you showed: The scriptwriter was the producer and he must have also done the voiceover. Separate artist on the whiteboard which was very important. Separate person built the WB/set? A camera/film person/crew. Separate credit for the whiteboard segment editor (NLE) I suppose. So this looks great, but took a huge well planned effort.