With several non-trivial caveats, namely:

1) "Proof" would require in-person inspection(not limited to buckled tubes/lugs/paint or steerer) , disassembly/reassembly, and test riding.
2) Photos commonly have distortion, and an accurate in-plane side or frontal shot can be difficult to achieve.

That said., overlaid traces to mark out the geometry can give a starting point.

Apologies for the rough qualty of the drawing using a cheap photo editor on a tablet with my finger for a stylus.
But I think you can get the idea:


The lines could be finer, as well as extended longer so that they cross (or align).