Alright but are the “usually written using hiragana” actually usually written using hiragana or is that just a meme?

So I'm reading a light novel (やがて君になる 佐伯沙弥香について) and either this author made it their life mission to fuck with japanese learners or these "usually written using hiragana" words are like never usually written using hiragana and Jisho is playing games.

I assume, it being a drama light novel, to be quite an easy read since the target audience is probably between 14-20 years old.

Question: should I be adding these "usually written using hiragana" words into my anki with the kanji.