I too am unsure as to the technical aspects of this either, just seems to fit the macro rules.
I’ve done over 1,000 self directed IRA real estate/Trust Deed transactions for our clients and I don’t see any red flags.
I’ll ask our rep at a couple of the big IRA custodians we work with if this would be 1) legit if explained in detail to the IRS, and 2) if they would ever connect the dots on their own (considering the gov’s history of ‘connecting the dots’ it is unlikely).
I’ll post here if I get any solid info either way.