That's quite an old tutorial. Inkscape 1.0 now has additional options, specifically Live Path Effects that can be used to do various distortions.

Specifically the Perspective LPE, in the Path Effects

Example

[![!\[enter image description here][1]][1]

Also you can have more than one LPE effect. Here is the same graphic but with an additional Envelope LPE distortion to curve the already perspective distorted image.

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/t3tIj.png
  [2]: https://i.sstatic.net/lDv7c.png