The debate seems to be around whether the word dyslexia should be used, but the condition --- however named --- exists anyway. The proposed phrase "struggling with reading comprehension" is no less broad, or actually more broad, than _dyslexia_, and in my opinion brings no additional value to the situation. I've known a person diagnosed with Dyslexia, and he was simultaneously one of the most well-read, eloquent pers…
"Even words he had to write daily (being a teacher and all), he couldn't spell with high accuracy."
It is not clear to me what that "condition" would mean in China, where "spelling" is not an issue (or at least has a completely different meaning than it does in English) and where it is relatively common for people to be able to read characters but fail to remember how to write them. It is also unclear to me how anyone could have a "condition" in which they struggle to spell if we did not have arbitrary spelling conventions i.e. if we used a purely phonetic writing system.
None of this is to say that there is no truly "universal" concept of dyslexia i.e. a neurological difficulty involving difficulty connecting symbols to meaning. In fact this article suggests that such a thing does exist and can be observed across various writing systems:
https://dyslexiaida.org/the-myths-and-truths-of-dyslexia/
A telling sentence from the conclusion: "It is important to note, however, that prevalence rate is highly sensitive to the criteria used to define dyslexia..." I would argue that a "true" medical/psychological condition should not be so dependent on specific cultural practices like spelling rules.