this can be said to be a bit true because in any case until now bitcoin is still a reference for price movements of all altcoins including ethereum, but what we need to know is that ethereum prices actually depend on sellers and buyers because prices will change and also depend on the situation of supply and demand in the market.

we can all imagine for yourself if you hold an etereum coin in your hand right now, at the same time there are millions of people who sell ethereum in other markets, so even though you feel your ethereum price is stable, actually prices change continuously.

If you want to exchange your ethereum with other coins, for example for other coins today you might pay 5 ether, but the next day it could be only 6 or 4 ethereum.