A toy language is a term for a computer programming language that is not considered to fulfill the robustness or completeness requirement of a computer programming language.
I don't think V has proven its robustness or completeness. One thing that could change my mind is if one of the applications got completed and was actually usable.
For example, I'm really interested in the Volt thingy - a lightweight, multiprotocol chat application:
https://volt-app.com/
But if you open the website, you can see that there is no Linux or Windows support, and most protocols are not yet implemented. I've searched for other projects written in V, and haven't found a single completed project.