Oh. I could've sworn he was referring to the Luna one. I dont remember seeing the mention of Marie Rose specifically there at the time. Must've not been paying proper attention. My mistske.
Regardless, from what ive seen recently a LOT of the bigger websites like Patreon, Pixiv/Fanbox, Subscribestar etc. have been cutting down hard on stuff involving characters that look like Marie Rose or Young Luna. Though since he was referring to Marie Rose specifically, then it is much more likely that there may be audio for it, but it is still over 3 minutes long when most audio for animations is mostly under 60 or 30 seconds unless there are multiple repeated loops. Also its christmas themed, so probably much less interest in it now its almost the end of January.
I personally just hope as many animations can get sound as possible, regardless of the character.