Demondice isn't signed with UMG & Hololive. Unless "Mori" and "Pink Woman" "collab" are specifically referring to 5-minute-videos with demondice then my bad.
It's been over a full year since the Haachama
anniversary message and 0 actual holo collab happened. Holo manager probs still too autist to allow it (and UMG has a branch in China). You can argue that haachama has health problem, but there are a long list of people who has been in line for a Holo Kson collab, including the fat girl in the 2 video you linked and a certain gorilla girl.
Does Pippa do irl stream so she can show up in those videos in the flesh?