My comment there was not that the Blackmagic Film transforms are different from IDTs, it was that a Resolve OFX Color Space Transform to ACES is not the same as an IDT, as it does not include a chromatic adaptation. This would be the case for any camera. The OFX ACES Transform does apply a chromatic adaptation, when applying IDTs.
Where two colour spaces have the same white point (most camera encodings use D65) transforming between them does not need chromatic adaptation, so using the OFX Color Space Transform to do this as part of a manually built ACES pipeline is fine. For example you can use a Color Space Transform to go from a camera encoding not included in the ACES Transform to one which is, followed by an ACES transform to apply that encoding’s IDT. I think that is what you were suggesting, @Orash_Rahnema.