Sure, ecash was meant to be used in small payments or for small amounts usually to be used without fees at the sacrifice of you needing a custodial for your balance (the mint) thus it is recommended to have small balances on these mints. Lighting on itself was meant to be non-custodial therefore incentivizing a higher capacity for sats on it, it has small fees, but comes with the headache of managing and rebalancing channels. So what its shown here is that if you have balance split among multiple mints, you can use this balance from them to pay a single invoice in lightning, thus reducing the risk of being rugged by the total amount by a single mint custodian, and not having to manage a lighting node to make big and fast payments.