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Figured out the answer on my own... I need to call the function rclcpp::get_logger() rather than the get_logger() method of rclcpp::Node.

For a test I added the following lines to the on_init() method:

rclcpp::Logger loger = rclcpp::get_logger("test_logger");
RCLCPP_INFO(logger, "Logging test");

Which resulted in the output:

[ros2_control_node-1] [INFO] [1685153874.083490048] [test_logger]: Logging test

And that's what I needed. Hopefully this will help someone else who doesn't read the code quite closely enough.