(except in some cases: bug)
Without clicking the link, #2 in the list indicates that the replacement transaction should pay additional fee of at least the minimum tx fee based from its 1sat/B fee rate,
ex: If the new RBF tx is 295bytes, then it must pay at least 295sat higher than the original tx; same with batching, but the minimum additional fee will be based from the batched tx.
TL;DR: You'll never be able to create a replacement TX with lower fees as it will be rejected by nodes.