Being able to read but not write Kanji is so common that it's a meme amongst Japanese people -- to the point where it's a game. For example, here you can watch some Japanese television people play a game where they compete to write words in 10 seconds or less:
> What confuses me is that other people can form images in their minds. Are all those with character amnesia also aphantasic? That can't be, given that aphantasics amount to less than 5% of the population, while a much larger number of people forget how to write (70% of teenage participants in a Chinese TV show were unable to write the word "toad"!).
They were discussing their aphantasia as a precursor to other very interesting points, e.g. about how "seeing" a character in your mind isn't enough to be able to draw it, --> verbatim traces and gist traces.
Completely off topic but that is the shakiest camera work I have ever seen, and I learned to shoot before gimbals were cheap and easily available. For that matter, it's been easy to automatically correct that sort of thin in post for years now. How were they not embarrassed to upload something so unwatchable?
https://www.youtube.com/watch?v=pqQQqLno9hw
I (and every other learner) have the same problem. It's not special, and has nothing to do with aphantasia.