Let me just say I don’t really care about an apology to Ladybug in the grand scheme of things that much. It’s something that would help his character a lot, but it wouldn’t fix all of his narrative problems. It happening off screen is poor practice in specific because the audience isn’t kept in the loop and is just expected to accept things as they are.
Adrian is just as pressing of a matter in regards to Felix, and yet we don’t see anything where they hash it out or come to an understanding. If they did off screen then it’s just poor writing for the audience, and even then him lying to Adrian undermines any apology he could make regarding the red moon incident as that was also done under the pretense of doing something he thinks Adrian would want. He made the same mistake twice and yet his hypothetical apology to Adrian, possibly happening around the same time, is supposed to be genuine?
It's an admission of how tangled and inavigable the current plot threads are. Who would Felix apologize to? What explanation would he give? The scene itself would beg so many questions that cannot be answered. Would he tell Cat Noir? Would Ladybug forbid him from telling Cat Noir? How would it come off and be in character? How involved in the conspiracy to lie to Adrien would people be?
They don't have the chops/will to do it well, but instead of owning that and moving on TA needs to gaslight you with 'its not important.'
