It isn’t a voronoi pattern. If you look at it, it is a diamond grid with the vertices displaced. If you examine it even further you can see it is actually one exact same panel rotated differently. The panel module is connecting each corner of the panel to some point existing in the middle of the panel. If you want to make it like that it is easy. Just model one panel, and array it, but randomly rotate the panel by 90 degree intervals each time it is copied.
Since you said you do not care about the panels here is a way to do it with a diamond grid mesh (you will need Mesh+ plug-in just for a quicker way to make a diamond mesh) then you can displace the vertices randomly in the XY plane.
DiamondCornerDisplace.gh (21.7 KB)