I think you guessed right. It could be phrased more clearly but I think they were just pointing out that since your comment is partially censored and your instance is known for word filter censoring, in their opinion your instance is not suitable for commenting properly. Maybe they wanted to inform you in case you didn’t notice or it was just a dig at lemmy.ml.
It’s not good for readability when random parts of text gets removed. I’m not familiar with the topic of this thread so I can’t deduce what Raremoved even means.