High Frequency IR for consumer electronics has mostly been the domain of useless Bang and Olufsen components and other marginal market products thankfully. Given that Matt was able to get the Harmony remote to work, it's not likely the Samsung are using these types of codes - they Harmony line is doesn't support these higher frequencies as I recall. Certainly not on its learning sensor.

It's more likely that it was simply a protocol that the preset URC didn't recognize or a mod to an existing protocol with the same result.