They used Nas’s version for the video and credited both albums which would make it a single for Nas as well.
And I don’t see how Street Dreams Remix doesn’t count when its entirely new verses and beat.
Singles format allows for different versions and remixes to be marketed/released together with the album track.
like
Hot Boys by Missy Elliot released as a single with 6+ alternate versions including the
Hot Boys remix ft Eve, Nas, lil mo n Qtip
Its still credited and certified as one single coz of the 'root track/ album track'
As for the thugz mansion Nas gets credit as his verse was used but it does not meet the
criteria for a single off his album. He gets credit as featured artist on a single off 2pacs album.
The Nas acoustic version used is track 2 on the 2pac's Thugz mansion single.
Thugz Mansion - Wikipedia