It’s a mindset which makes the following ideas seem natural
I think within “realism about rationality” there are at least 5 plausible positions one could take on other metaethical issues, some of which do not agree with all the items on your list, so it’s not really a single mindset. See this post, where I listed those 5 positions along with the denial of “realism about rationality” as the number 6 position (which I called normative anti-realism), and expressed my uncertainty as to which is the right one.
I think within “realism about rationality” there are at least 5 plausible positions one could take on other metaethical issues, some of which do not agree with all the items on your list, so it’s not really a single mindset. See this post, where I listed those 5 positions along with the denial of “realism about rationality” as the number 6 position (which I called normative anti-realism), and expressed my uncertainty as to which is the right one.