Locally server behaves different from browser extension

I was using the LanguageTool extension for Firefox in overleaf, but I wanted to integrate it into a vim plugin. While trying some test sentences, I found that the local server doesn’t show the same errors as the extension. An example: “I made a typo so I am sad.” the browser extension suggests a comma after typo, but the local server thinks this sentence is correct.

Is there any way to get the same outcome as the extension, or does the extension just use a proprietary instance that has more features?

Thanks in advance.

That’s indeed the case. There are some rules running on the Cloud endpoint which are not part of the Open Source version.

And is there any way to enable these rules? Perhaps with --enable --rulefile or --remoterules?

No, they are not part of the Open Source version.