Let me put it this way...
if "Southern"
only means white (presumably racist) descendants of the Confederate South, you're going to have to tell all the black people here they aren't white enough to be Southern, no matter if their ancestors were here before most of the white people that live in the South today. Are
you volunteering to do that?

You'd also have to tell all the people (white or otherwise) who grew up here or are only a generation deep that they don't count, either. I find that both unfair and arrogant.
Here you are getting into the issue of how to define the US "South". I had a little question in my own mind how to define this years ago when trying to explain it to people in a far away country, for whom South and North sound like simple compass directions.
Kansas is apparently in the geographic center of the continental US:
So if the "South" simply meant Geography, then wouldn't one consider Los Angeles, Nevada, southern Illinois, and southern Ohio, "Southern"?
Instead, it seems that "Southern" implies the former US Slaves States or Confederacy, with MD, WV, KY, DE, etc. being borderline areas due to their mixed status on those issues. For example, WV was environmentally inhospitable to plantations, and thus to slavery, and WV seceded from Virginia during the Civil War, seeing no practical point in fighting the Union to preserve slavery.
So we seem to be talking about some kind of distinguishable Slave State or ex-Slave State identity, rather than a simple issue of geography.
To get back to the OP, I am fine with St. Vladimir's if it wanted to relocate to Texas, principally because no EO seminaries come to my mind in the US South. But my point in the OP is that The South has certain aspects that EOs moving there should be aware of.
Supposing that ethnic minorities, particularly African Americans, are no less "Southern" or have no less "Southern" identity than a Confederate heritage family, it is still one thing to belong to a society or region and another thing to feel welcome in it. I recall one lady from another country (like a Palestinian woman in the the Israeli State) saying that despite being born in her society, she never really felt welcome in it. Would African Americans watching ROCOR'S Ortho Dixie documentary feel welcome in SC ROCOR churches from watching it? I would not if I were African American and were learning about ROCOR for the first time.
I would want St. Vladimir's to make itself be especially welcoming to Ethnic minorities if it moved to the South, and to avoid the pro-Confederate theme in the ROCOR documentary:
youtube.com/watch?v=lb6ZLx0qPNY&ab_channel=EasternAmericanDioceseROCOR