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I think it was meant as a joke, so for anyone else reading it, no it is not actually double-buffering.

Half a joke, because the concept is very much the same. You "paint" to an invisible buffer and then you swap.

Yeah, but the concept of double buffering is to swap every frame, for performance gains.

Here nothing gets swapped, and just temporary the screen gets hidden. So vaguely similar ... but not very much the same in my opinion.

freeze-frame buffering

Performance gains is kinda iffy. You actively hurt latency for the sake of consistency. Even more with triple buffering.

double-bluffering?