The ideas seem fairly clear to me. They're working on projects that are much more complex than what they were able to approach before, and they're able to dive into topics that were previously out of reach because of AI assistance. The grammar may not be perfect, but the point is understandable.

If you want to give feedback, the Hacker News guidelines encourage responding to the strongest interpretation of someone's argument. Instead of criticizing the way something is written, you could rewrite it in a clearer form to demonstrate what you mean. That way it's constructive, and they have something to learn from.

https://news.ycombinator.com/newsguidelines.html

Chinese. https://en.wikipedia.org/wiki/Chinese_punctuation

Chinese uses different symbols for punctuation and the comma in particular is surrounded by padding.

...good question. This (standard) excuse is designed to make you feel bad for potentially insulting someone trying their hardest, but it doesn't make any sense.