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Looks like it was made with TopoR autorouter.

https://www.eremex.com/products/topor/

Looks beautiful to me. Rectilinear tracks were an artifact of early layout software; there's no electrical need for them.

I find it visually easier to trace tracks that aren't perfectly parallel, too. This is splendid in that regard, pairs are obviously pairs, but their spacing to other pairs is variable (which also suggests slow transitions in impedance rather than step-changes; another benefit).

If anything, this looks like it moves a lot of components out into their own space, where they won't be shadowed by others in case of rework. Looks great to me.

Yeah, this PCB is... horrible.