Number one: you're using an overloaded term, but I suppose that your specific social conditioning has given you a specific concept of the definition of normal self expression that this clearly falls out of those boundaries.

Number two: this person's goal CLEARLY isn't to fool anyone, it's not a deep fake video, and it's frankly none of your business or concern that they enjoy using an animated avatar.

What is "normal self expression"? And what do you think they're trying to fool you about exactly?

edit: clarify

When they were new, most people thought of nose jobs (and other cosmetic surgery) as being weird and creepy. Some people still do. What is “normal” is a function of commonality, and at least VTooning does not cost a fortune and risks neither complications nor needing further surgery for years to come.

You sound like that religious old guy I see every now and then, who always annoys young people passing by for having tattoos and piercings.