You are right. And trading Bitcoin itself during periods of low volume is also dangerous.
Low volume is low volume, there is no one number fits it all because them we would fall into the Sorites paradox

There is no way to say $x is high volume but 1 cent below it is low because it would be paradoxical. Adding the relativity to it makes it even worse, because most DeFi projects die from low volume and liquidity, which leads to attacks that deplete their pools (well, if you are the attacker then you can definitely profit from low volumes), and it is not me or the relativity to Bitcoin that says the volume is low, it is the depletion attack itself, that only happens because the volume and liquidity is low....