I think it's fairly reasonable to attribute the baby's seizures at 12 hours to an etiology other than HIE. The cord gas is ok and also the gas at 1 hour can be attributed to the resuscitation YES. But it could be also respiratory as you have not mentioned the PCo2.
And again regarding the gas at 1 hour of life... It's not that acidotic to start cooling ( Looking at the CPS statement of 7.15)
I think guidelines are made for those situations ...to help when things get blurry. Sticking to it as is the right thing for me until an alternative approach has established evidence behind it.