As I said @cguy is getting his information from news sites (and his own very personal opinion), rather use a professional (and not a "top professional" that runs a home office from Kempton Park - preferably someone who's worked for one of the big accounting firms for 45 years until last Tuesday).You can just get a document from SARS that states that you have no tax owing and no tax returns due. I have such a document.
FE still doesn’t mean that you aren’t a tax resident, and it certainly isn’t required.
It would be good to get another professional in, but the tax residency rules are public, and we already have a discrepancy between professionals (although, I strongly suspect that the top professional I hired holds more weight than a retiree who consults for free). A third opinion with some justification would be a benefit.
In fact, ignore the professionals and use someone who has experience in these matters.