Hey @Miasanrot thanks for all this detail, it’s much appreciated!
The first thing to investigate here is the 403 comment sync error in the logs, which seems related to your issue of not seeing comments. A 403 error means that WP Discourse is not able to access Discourse, probably due to an authorisation failure.
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On the “Connection” tab in the WP Discourse admin panel do you see a message that says “You are connected to Discourse!”?
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As you’re using the “Proxy Real IP - 1.1” Wordpress plugin I’m curious about the networking environment of your Wordpress and Discourse. What role is that plugin playing?