I mean tbh there's not really much here to learn that we didn't know already so I'm not surprised it didn't go viral. All this slip up really says is that Dammon had lines recorded for figuring out how to fix Karlach's engine, which is not really surprising considering all of the wild voice lines we've found in the files. There are voice lines recorded for a Minthara pregnancy arc. There are voice lines recorded (and animated) for Karlach finding out she's in a videogame. There's voice lines for Karlach watching her friend's reunion from the City of the Dead. Karlach's engine having a fix is so glaringly obvious I'd frankly be surprised if they DIDN'T have voice lines recorded for it. It's just for whatever reason, it didn't make it into the game, but a lot of other things didn't either.
The more important thing is that people are still bothering Larian on basically every platform to fix Karlach's problem, and honestly I'd prefer them cooking up something new and exciting rather than just have Dammon jump in and fix everything.