https://wiki.ros.org (https) is fine.
Note there are lots of links to HTTP, such as the headline of https://github.com/ros-infrastructure/roswiki
And it is bit related to Enforce HTTPS on ROS Wiki and https://github.com/ros-infrastructure/roswiki/issues/244
As getting HSTS preload ready, approved and released into browsers takes a while, it would be sensible to have ROS.org added to HTTPS Everywhere. Someone requested it at https://github.com/EFForg/https-everywhere/issues/16879 , but nobody stepped up to do it.
Are the ROS related entries on https://github.com/EFForg/https-everywhere/blob/1254c87a54f15b1c0834d264825b806a04192170/src/chrome/content/rules/osuosl.org.xml still accurate?