She is definitely NOT infantilizing herself for a fetish. She is very responsible and careful with that kind of stuff - I think a really good example of this is when she refused to condone / joke about murder in the video she did with that mulatto lady.
When she was talking about infantilization, the context of the video was that 30yo/40yo/50yo women are being forced to get botox to look like they're 20 (I don't think that's a fetish either).
I would say that she (an adult woman) has presented herself as a young school aged person for views (money) - this, I think, is a textbook example of infantilization. I think a really good example for this was her "do you have games on your phone" video, because it's very obvious and very extreme, but there are many other examples.
I was just amused by her glaring blind spot, I don't think she's doing anything bad.
Another thing I find funny/amusing is people bending over backwards trying to convince themselves, that asking "do you have games on your phone" is something adults do.