In my opinion
Altcoin pump or dump depends on whether the price of Bitcoin increases or decreases.
Because Bitcoin is the number one cryptocurrency.
It is also part but not all, bitcoin is important, but it doesn't decide everything. Most altcoins will follow the trend, but there are many opposite, bitcoin decreases but a few altcoins will increase strongly.
In my opinion, what is meant by pump and dump is a coin whose price is pumped up high but with a transaction volume that is not too large and usually the price falls quickly after reaching its highest point. I don't think it has anything to do with an increase in the price of Bitcoin because although many altcoins go down when the price of Bitcoin goes up, the fall in the price of legit altcoins is quite slow and not drastic.