HMDA exempts construction only loans (for the initial construction of the dwelling), Bridge/swing loans and other temporary financing.
The initial construction loan of the builder is exempt. The first refinancing of that loan is reported as a purchase, subsequent refinancings of that loan are reported as refinancings.
is still temporary (they will pay it off when they sell the newly built home),
That is not temporary financing (a loan designed to be paid off by longer term financing), that is short term financing.