Could I suggest it is rotated 90 degrees and then "tilted." Same as swing on LF.
To me it seems like the plane of focus almost stretches directly from the lens and into the picture, and not on an axis from somewhere on the right to somewhere on the left or vice versa, like a TS lens normally would give. Id give my vote to PS...
The canon lenses can be rotated, so no prob. there, but still... just seems too much for them (i use the 24 and 45 ofthen, and would not be able to reproduce the effect I see here, maybe on my linhof, but i have not tried )