Crypto-exchange checkers won't just scrap random data somewhere so there is a valid source.
As long as it is not CMC then that's true. CMC scrapper is terrible. They even list Vindax as the top exchange with a distinct wash trading.
I'd instead use Coingecko, their Trustscore is reliable, at least for now. It tracks the order book depth so you'll know the liquidity and not the (fake) adjusted volume.