If I want to participate in a conversation in a language I don't understand I use machine translation. I include a disclaimer that I've used machine translation & hope that gets translated. I also include the input to the machine translator, so that if someone who understands both languages happens to read it they might notice any problems.
You are joking right?
I mean we probably don't talk about someone not knowing english at all, that wouldn't make sense but i'm german and i probably write german.
I would often enough tell some LLM to clean up my writing (not on hn, sry i'm to lazy for hn)
You are adding your comments and translating them, thats fine.
If it was just a translation, then that adds no value.