Based on multiple reported experiences at other schools, don't read into it.
Some schools did targeted outreach to URMs to try to pull them in. For all others, it's a cost free way to pull in incremental secondary fees and/or just to increase the applicant pool, which makes them more selective and helps their ranking.
Someone on another thread reported a very fast R after responding to such a solicitation. Not saying that would happen here with you. Am saying you shouldn't do anything you wouldn't do anyway just because an admission office is inviting you to. Unless, of course, they are willing to waive the fee. In that case, it would be a free shot for you, and you should take it if you have any interest at all.