Not that I doubt them, but I sure as hell can't remember anything from when I was 4, so I'd be unable to definitely rebuke any claims about my actions during that time.
I remember the important stuff from when I was 4. I liked picture books, computer games, playing on the swing, and hot wheels. We didn't have a computer at home but we had one at school and I liked playing the educational games. Also I tried a pear when I was 4 and I hated it. I still do. Fuck pears!
If Ensign Rutherford can hate pears, suffer from brain damage in the line of duty, start liking pears, undergo neurological treatment, and start hating pears again, maybe pears can suck. Maybe some people just don't like pears and never will unless they get a cybernetic implant ripped out of their head while trying to blow up a Pakled dreadnaught.
Infinite diversity in infinite combinations. Some people are just gonna hate pears and that's okay.
Pears can indeed have very different tastes. There are some i really don't like, the bland ones, taste like nothing. Some others are really juicy, sweet and yummy.
I remember this blue curtain with giraffes and lions (and I'm sure other animals but those are the two I remember) that I liked and got to see during snack time. I used to imagine I'd be playing with them and how cool they were. I also remember watching GoBots in the morning. I was also fascinated by rollypollys and caterpillars one day in the outside play area for some reason. Just a few examples from preschool when I was between 3 and 4. I started kindergarten when I was 4 during that school year when I was close to turning 5. I remember my teacher from then and her really visible varicose veins and her pointed toe shoes that seemed way too small because the skin from her feet pushed up out of them a bit.
None of that is stuff my family would have been like "Hey, remember blah blah?"
How does this help? Vivian didn't say she remembered being four and not saying those things, she said when she was four she clearly wasn't going around miming gay stereotypes like Elon Musk claims, because no four year old is:
picking out clothes for their parent and describing the outfit as "fabulous"
enamored with musicals and the theater
Vivian's point is that these are not behaviors typical of a four-year old. The person whose testimony would be valuable is her mother's and nannies' who actually were there when she was four years old (unlike Elon Musk).