I read the blog. It was pretty bullshit. The writer obviously had beforehand decided she doesn't like Ichikawa because her drawings objectify women. To be fair that is kind of a valid complaint in anime/manga as general, but the part where the ball is entirely dropped is when the writer decides HnK is some sort of fetishist violence because the gems shatter often. And because HnK apparently doesn't have enough to complain about, the writer then proceeded to dig previous works that have pedophilia in them. And because this is Tumblr you apparently cannot talk about pedophilia even in a neutral way unless you are PEDOPHILIA SURVIVOR, which means Ichikawa has no right to draw a manga about the topic.
This is a legit quote: "I was groomed online and in real life by multiple pedophiles when i was 10-14 years old. They used loli / shota porn and pedophilic ships (fanart, fics, etc)--"
So basically the person writing the blog is a "pedophilia survivor" because someone online posted her a picture of a loli.
Tldr Tumblr is fucking stupid again, who cares.