Generally an unhooked candidate shouldn’t submit test scores if below the admitted student median, but of course there is some nuance there.
But OP, a URM, is hooked and that is why posters are recommending OP submit test scores everywhere. There are posters on these boards who are URM, and/or low SES who know this because they have gone thru the process themselves, or with their kids.
There are posters on these boards who work or have worked in admissions and/or are college counselors who work with URMs and/or low SES and/or other hooked applicants every day.
I don’t understand why anyone who doesn’t have this direct experience feels confident in not only giving their opinion on the matter, but also are willing to double down on that opinion when those with more experience clearly lay out the reasons for their recommendations.
With that said, I do understand that you are trying to help, but understanding the limitations of one’s experiences will help one make better and more meaningful suggestions.