Computer languages are human languages, because the purpose is to communicate to humans what you're doing. Unless you want to write raw bytecode?
- how the brain "reads" an Ikea instruction?
- is it similar to non-verbal communication?
- do you vocalize an interpretation of the instructions?
- 3D projection in your head?
- What are the differences between seeing an object, hearing a word that represent it, reading the word? (Now thinking about sign-language, braille...)
I just picked an Instruction set to see, but realised I was already biased with the expectation I had of how I would decipher it.
I.e. your argument isn't really that Javascript or C are human languages as defined by the linguistics professor but that he or she ought to augment or alter his or her definition of "human language" to include them.
A fully visual programming environment would have more in common with standard programming languages than a spoken language.