That’s right. Even Japanese people have a hard time understanding what anime characters say because it’s such a foreign language to them. They have to take a special course in school called “anime language” which helps them understand it, just a bit. Even then, most Japanese people can only understand about 70% of the words anime characters use, which explains why the dialogue often seems pandering to viewers with small vocabularies.
And with that, the “even Japanese people don’t understand Japanese” meme was put to rest. Hopefully .