Twinned Summoner question

[Merellin]

So, I was curious about the Twinned Summoner.. It sounds intresting, But is it only for the unchained summoner or for the regular summoner too? I'm asking because PFSRD has it listed under both and it does say "The twinned summoner’s eidolon is restricted to the biped base form. An unchained summoner’s eidolon is instead restricted to the twinned eidolon subtype." wich seems to imply the regular summoner can use it too.. But Archive of Nethys only has it listed under the Unchained Summoner.

[avr]

AoN is clearly wrong here. It even has the same piece of text but failed to notice it. The archetype's replaced abilities exist on the original summoner and can be used without alteration.

[Merellin]

Oh? That suprises me with how much praise I hear for AoN and how much people seem to prefer it over PFSRD. But if AoN is wrong, That means I could actualy use it! (In my gaming group we dont use Unchained.. Dont know why.. But the GM and other players have said that the regular summoner is alright, And I try to build to a theme and always tries to avoid going for power.. xD)