Clarification on Sacrament Alchemist

[That Crazy Alchemist]

The Sacrament Alchemist is an alchemist archetype and has an ability that is a bit unclear to me.

Divinely Inspired Alchemy wrote:

(Su)

At 3rd level, a sacrament alchemist’s faith inspires him with ideas for novel alchemical achievements, although the mental strain means that he can’t reliably repeat them. Once per day while preparing extracts, for a period of 24 hours, a sacrament alchemist can gain an alchemist discovery for which he qualifies. He treats his alchemist level as 2 lower for the purpose of this discovery.

This ability replaces swift alchemy.

I bolded the part I'm a bit confused by. What exactly is affected by the 2 levels lower thing?

- Qualification for the discovery in question?
- DCs and level-based effects of only effects granted by the discovery?
- DCs and level based effects of ALL effects of an ability that is modified by the discovery, even if the discovery does not affect that part of an ability? (ie choose Smoke Bomb as discovery, does this lower the bomb damage too? Or how about caster level for extracts used with the Infusion discovery?)

[avr]

I think that's the second, DCs and level-based effects modified by the discovery. If you add stink bomb it should do full damage, but the save DC would be 1 lower. If you add smoke bomb the save DC wouldn't be affected because that discovery doesn't use the save for its effects.