Wormholes for matter and energy are not incompatible with physics. We just probably won't ever see one like the one he proposed, because creating it would require manipulation of matter or gravity at extreme scale.
But, it is wrong to say it is impossible. It is theoretically possible.
https://en.wikipedia.org/wiki/Kip_Thorne#Wormholes_and_time_...
Wormholes for matter and energy are not incompatible with physics. We just probably won't ever see one like the one he proposed, because creating it would require manipulation of matter or gravity at extreme scale.
But, it is wrong to say it is impossible. It is theoretically possible.