Absolutely! Because as we all know, everyone speaks English.
The GP's point was that greek letters are used in lots and lots of papers even written in other languages. I have read quite a few papers in Japanese that used exactly the same conventions with respect to the greek letters and latin letters used.
Even China, despite their best effort to de-westernize their culture still uses English in their research papers.
And if all the above wasn't enough, Julia's libraries are still all in English so if an hypothetical researcher's English is so poor that they don't know what "learning rate" is, I'd venture that they'll have trouble programming in Julia/JAX/PyTorch.
If you're instead asking of how many can struggle trough an english text supported by machine translators, then that's clearly almost everyone.
There's very often a significant gap between the ease with which the native and the foreign language can be used for reasoning, but surely I don't need to point that out since any bilingual person knows this.
edit: as an example, when programming for Brazilian businesses, we generally just use a mix and match of Portuguese and English like getFinanciamento. "Get" is a technical concept while "Financiamento" is a business concept and it often doesn't make sense to translate either. Best just to leave them both in their respective domain-native language.
In case of maths, Greek IS the domain native language. Now, I wouldn't necessarily enjoy a codebase with Unicode variables for other reasons, but using Greek is best to map directly from the equations.
Flux, the Julia framework that we are discussing, is in English. Its classes, function names, optimizers, everything is in English. Keeping parameters as Greek letters and arguing that it's easier to understand is insanity.
Classes are a programming concept, they do map to the programming domain. Even optimizers and functions probably do map to a named mathematical concept, not to a Greek letter. But prameters probably map to a specific symbol in an equation.
In Mathematica, for instance, we use Greek letters and it allows you to just type an equation in the proper visual form. So much easier to map it when you're working with the actual domain-native names and formats.
I understand the sentiment here, especially as English is not my native language, but for many domains, for anything close to the state of the art, English is lingua franca.