Him not taking sides might actually be beneficial. Most of the Lily videos I've seen tend to feel like they're personal, and if your goal is to educate people who are already inclined to Lily's side having that tone going in can be easily dismissed as jealousy or sour grapes.
And Lily's got an... interesting history. The Tara Callie lies, writing both Stockholm and Animal Magnetism, lying about being in an accident that permanently crippled him, sock puppetry, mass censorship of her videos... I'm not super familiar with Down the Rabbit Hole's general content, but Lily's early history especially is already intriguing, and it being told from a neutral position would probably be more beneficial than coming from somebody who already doesn't like Lily, for whatever reason they would have.
You might also try getting in touch with
thassabadtake? She hasn't posted to that Tumblr in a while but her intention was to collect information and make an expose video on Lily.
This disturbs me deeply and I was trying to figure out why until it finally clicked.
She's associating this character with Lizzy, and offered her up to a fanbase that is known to send Lily non-con lewd Asks. She's implicitly requesting people draw pornography of a character that does not belong to her and whose creator would not want pornography drawn of.
She's tacitly telling people to make vengeance rape porn of Lizzy by way of her character.