It makes no difference whatsoever to the whole what you’ve pointed out here.
Throughout the video, she states she’s responding to critics. Her whole attitude is of teasing those who accuse her of not knowing what she does (calling her chips fake, etc).
When she says that, it’s perfectly clear that she’s being very (and I mean very) sarcastic.
We can discuss if her use of sarcasm is useful or not, but then we will be discussing the specifics of her presentation, not her skills at doing the chemical process she just demonstrated.
Since this is a video about “Making Microchips at Home”; since she’s responding to critics; I think we can allow her some room to throw some sarcasm to the mix, even if it does not work out completely as intended.
On a side note: it would be nice if people on the internet would allow others some “humanity"; by that meaning giving them room to err, like saying silly things when they are annoyed — instead of nitpicking bits of unimportant information.
The Internet is already too noiseful as it is.