in theory, yes, you can do the same things with tap jump on and off, but because of the way the human mind works, that person with tap jump on will be the slightest bit slower because our brains will be processing more buttons to press with it off compared to on
fino: its proven by frames, not even theoretical, but a factual infinite, the reason it can be applied by snakes (ive only seen candy and ally do this though) is because their minds are so focused on that exact moment and waiting for the first little movement, that they can expect and react extremely quickly
second thought: theoretically, if someone applies the same thought to doing an upair with tap jump off and is waiting and expecting that moment for more than a second, they will be able to do it at the same speed as someone with it on, its just much more difficult to get into that mindset in this situation