i call it big plot hole
if he didn't travel to Kaguya's dimension yet how the fook he knows that was kaguya jutsu
Yes, but she has the Nue's power in her palm.
I also think the nue helped Sasuke to locate that dimension.
Bonus:Can that be a byakugan ability?That' s the first thought that came to my mind when I saw Kinshiki use a portal.
Boruto could see through dimensions with his eye.Momo could "stop time".And now Kinshiki can open S/T portals.Interesting mystery.
i call it big plot hole
if he didn't travel to Kaguya's dimension yet how the fook he knows that was kaguya jutsu
This is why anime shouldn't be a reliable point of reference for Naruto and Sasuke's feats. They have been beyond nerfed, at this point SP might as well make Sasuke blind and Naruto cripple.

oh its translation error thanksagain read page 1
it was a translation error
Filler.
OT Filler.
i call it big plot hole
if he didn't travel to Kaguya's dimension yet how the fook he knows that was kaguya jutsu
I think the Nue conspiracy is what led him to gain access and pinpoint Kaguya's dimension. The Rinnegan might as well granted the ability as default. But he needed the info about the Nue still.
BONUS: I like the hierarchical development for the Ootsutsuki clan. Seems that dimension travel is a common trait with those with the Rinnegan. But Kinshiki didn't have Rinnegan right? How the hell does he do that?
The Last has shown Sasuke traveling through Kaguya's desert Dimension :|
The Last has shown Sasuke traveling through Kaguya's desert Dimension :|
The only good thing about the Last was Toneri's designs :lolAnd The Last is canon. Rip plothole
The Last has shown Sasuke traveling through Kaguya's desert Dimension :|
The only good thing about the Last was Toneri's designs :lol
And Sasuke saving Konoha.
The only good thing about the Last was Toneri's designs :lol
Hiashi was there, so that couldn't have been another dimension