The level of denial and butthurt in this thread is astonishing XD I'll put it like this.
Kurama said that Sasuke was using his Susano like a container for the bijuu chakra, like Gedo Mazou
Sasuke absorbs the chakra and that powers up his Susano at vote 2
We all know Naruto can hand out free power ups via Kurama chakra (did it in the war arc allot, even for Sasuke)
We see the see that the 1st time Sasuke ever showed something resembling PS was when he merged with Naruto's Kurama avatar against Obito (bijuu chakra boost)
The 1st time we see him use PS on his own was after receiving Hagoromo's chakra not before.(sage chakra boost)
The 1st time we see Sasuke use bijuu Susano was after absorbing the bijuu chakra, not before (bijuu chakra boost)
The 2nd time we see bijuu Susano is when his Susano is the container for Kurama (most powerful bijuu) in the Boruto movie much like his Susano was a container for the bijuu chakra at vote 2
These are clear facts idk why it's so hard to grasp.