I don't have time to make videos, sorry. And I'm also not good at making videos.
But as I said it is simple as 1x1.
Try to switch the THC on, do M3 to turn the switch on. And ofcourse set the antidive threshold % to other than 100%.
Because there are no inputs in demo mode you could use the virtual THC inputs, assign hotkeys for them in the hotkeys menu, to the virtual THC up/down and arcon signals.
Then you could emulate the inputs with 3 buttons.
No make a g-code file which make some G1 movements with known feedrate.
Make direction changes in the g-code, e.g. with G1 which moves left and right and left and right etc.
Then try to control the THC up/down with the assigned hotkeys.
You will notice that the Z down will be blocked when the feedrate drops on the direction changes.
Have a nice day!