At 20th level, a martial master can use this ability to gain the benefit of any number of combat feats as a swift action.
Does this literally mean I can have all the combat feats as a swift action?
No. There is a sentence that says after it that each feat is still a use of the ability.
It doesn't state the sentence in the archetype, however it does in the Brawler class. RAW, this means you can use all the combat feats, because I find it weird, and hard to believe that the development team didn't state the last sentence.
Edit: Maybe it was a deliberate act to create controversy, and get people talking. Am I crazy?
Probably didn't have the word-space. This wording still exists for Martial Master
At later levels, when he gains multiple feats through this ability, the martial master can use those feats to meet the prerequisites of other feats he gains with this ability. Doing so means he cannot replace a feat currently fulfilling another's prerequisite without also replacing those feats that require it. Each individual feat selected counts toward his daily uses of this ability.
Right. Makes sense now. I overlooked that. Thank you for clarifying.