I actually think that there is a good representation of robotics on HN, the posts just don't always make it very far. So personally I subscribe to
https://hnrss.org/newest?q=robot and
https://hnrss.org/newest?q=robotics (RSS feeds).
In terms of news letters, besides the Robot Report, there is also https://www.weeklyrobotics.com/ and recently this guy has been advertising his newsletter on HN a lot (which also seems decent but I haven't followed it in detail): https://thegraspnewsletter.substack.com
Kat's weekly news on ROS Discourse are really well curated, too, I think:
https://discourse.ros.org/t/ros-news-for-the-week-of-june-17...