There is
slide guitar bottleneck style and there is steel guitar. Two separate things. For bottleneck you fret some of the notes and use the slide on some of the other notes.
A Weisssenborn is a downright steel. Meaning all the left hand does is use the steel bar, hence the name "steel guitar" You'll notiice the strings are extremely high above the "fingerboard" , much too high to fret any notes
With this style the frets are a formality, they may as well be painted on.