It's L2, but you can have different types of L2s. With lightning network, you're opening and closing channels with a counterparty using on-chain transactions, so each channel can be tied back to an on-chain transaction.
Before someone points out that it would require tons of on-chain transactions to onboard everyone onto it, you can batch thousands of channel open/closes into a single transaction with new protocol upgrades.
Before someone points out that it would require tons of on-chain transactions to onboard everyone onto it, you can batch thousands of channel open/closes into a single transaction with new protocol upgrades.