Holy Skills (Esoteric Medicine and Exorcism) and Power Investiture question

[psydraco]

Hi, friends!

Does this two skills gain bonus from Power Ivestiture (Holy)?

As in Adventurers p. 20

Add its level (maximum six) to all rolls required to use Holy abilities.

So it does not include the two Holly Skills Esoteric Medicine and Exorcism because the book separete Holy Skills from Holy Abilities?

Or I can consider Holy Skills as Holy Abilities and, for example a Cleric can have Healer and add both PI bonus and Healer bonus to Esoteric Medicine?

Thanks!