You made a loan (contract for deed) to purchase a dwelling secured by a dwelling therefore it meets the definition of a home purchase.
And before you counter it is a contract for deed and not a loan you need to go to Reg Z and review the definition of a creditor and the definition of credit.
Hopefully you made all your required disclosures under RESPA and Reg Z.
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The opinions expressed are mine and they are not to be taken as legal advice.