It lets you choose it as a rogue talent. It does not give it to you. Hope that helps!
It says nothing about being able to ignore prerequisites when you choose it as a rogue talent. You can't select it as a rogue talent until you meet the prerequisites.
Why it's offered as a rogue talent: So you can use the Bonus Feat talent for another feat. Same reason for the weapon finesse rogue talent.
Why it's given at 2nd level: because that's when they get the rogue talent class feature, which this modifies. A fighter 1 / rogue 2 can easily meet the requirements at 2nd rogue level.
Why the improved version is given at 10th level: that's when they get advanced rogue talents and to save your Advanced Rogue Talent bonus feat.
Surprise Follow-Through (Combat, Orc/Half-Orc)
When striking one opponent, you catch its ally off guard.
Prerequisites: Str 13, Cleave, Power Attack, base attack bonus +1.
Benefit: When using Cleave or Great Cleave, the second foe you attack on your turn is denied its Dexterity bonus against you.
With the ability the rogue gets, I would tend to read that as:
Benefit: The second foe you attack on your turn is denied its Dexterity bonus against you.
Otherwise.. its sorta meh to get.
You could select it as a 2nd level Rogue if you are a multiclass. The Rogue talents only take into account Rogue levels, but you can have other levels first.
Funny, I had to work out the same logic that Cheapy states just this past week! My wife wanted us to make some new PFS characters designed as a brother-sister team in combat, and she liked the idea of a Skulking Slayer/Scout rogue, but had similar questions about how the first of those archetypes worked.
Either way you go 1 lvl fighter 2 lvl rogue or 3 lvl rogue you need 3 levels. I'd go 3 levels of rogue and get your 2nd sneak attack die. So second level power attack third level cleave and Surprise Follow-Through (Combat, Orc/Half-Orc) as per 3rd level general feat.(rogue talent/combat feat).i dont under stand how you are doing this in 3 lvls of rogue.
lvl 1 feat of choice do not have bab +1 so none will matter.
lvl 2 take surprise follow-through as your rogue talent.
lvl 3 power attack
lvl 4 cleave with rogue talent combat feat.4 lvls of rogue this is the only way i can see getting it the fastest if you go all rogue.
I think you mean: 2nd rogue talent (combat trick: Power Attack); 3rd feat (Cleave); 4th rogue talent (Surprise Follow-Through). But yeah, still requires 4 levels if single-classed core rogue.
(I don't own Unchained, so don't know if that would change anything--or even how archetypes interact with the Unchained classes.)