What phase is the people that filed head of household and claimed credits considered to be in since the Irs doesn't make mention of that filing status for the10200 credit

They say simple returns in phase one those with credits and then married and more complex in phase 2 so what is head of household claiming eitc is its no mention of the specific filing status related to the Irs phased approach to recalculation for those that filed early before the 10200 tax credit