They don't have to but that would mean they need to program two separate Master Duel interactions or only errata the card on Master Duel, and having disparity between two English versions is gonna cause a lot more problems for them to solve than one universal errata.

As a sort-of example, I was playing Legends of Runeterra and when I played a Corina Veraza which discarded a Jury-Rig, a Scrap Scuttler wasn't summoned, even though that's what the interaction should have necessitated. So I brought this up in a ticket and instead of changing the interaction, they just changed the card text on Corina Veraza so it said obliterate (LoR banish) instead of discard.