Awesome! Finding footage of some of these games is hard, I'll probably link to your videos whenever I want to show gameplay (before emulation is complete.) Also, what system did you capture these on? The color palette is different than the video I linked to.
Yes it's the radofin telesports iii. It's a slightly later model of the pc 50x setup in that it has a colour palette switcher on the back with 3 settings: green, red and blue. I tried to pick the best contrasts for each game, but all the colours in each setting is the same (background, grid, player 1, player 2, missile).
It isn't unique for this feature, but I think most if not all carried the 'iii' designation to split it from earlier models. They should all have audio through rf too, earlier models will be like the binatone TV master and fairchild channel f model 1 and have external speaker from what I remember.