What kind of transaction are you talking about? Getting “real” money in and out of coinbase or making crypto currency transactions (as in, sending bitcoin to someone)? The thing you cited is about the former. For transactions on the blockchain (the latter case), there are also transaction fees that are most of the time a dynamic thing and not a static percentage of the amount transferred.

https://help.coinbase.com/en/coinbase/trading-and-funding/pricing-and-fees/what-are-miner-fees-and-does-coinbase-pay-them

https://river.com/learn/how-bitcoin-fees-work/