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There's plenty of tricks that can be done with the Amiga's hardware.
With the way the copper is and it's legacy design from the Atari 8bit it is generally easier to do vertical video splits. The copper can also wait or horizontal lines with some limitations.
With that said, the first demo they're either blitting or given the low number of bitplanes maybe changing video addresses at different positions so they are genuine rectangles... I dunno... quite a few ways to do it really I suppose.
Second demo I can probably guess but is probably copper splits for the horizontal movement and blitting for the vertical.
I'm probably wrong as I'm not a demo programmer... but that's how I'd do it.
Geezer
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