Tom, I've seen that web-page before, but it's not really very objective, the tests are too cursory, and there's a lot of flare in the images.
I've had 2 90mm Angulons, the first was Ok, useable but very limiting due to its poor coverage, so I sold it when I bought a Grandagon. In comparison the Grandagon's a real pleasure to use and far more flexible, in 20 years I've never run out of coverage.
I bought my second 90mm Angulon last year, they are ridiculously cheap now, it fits my hand-held 5x4 Crown Graphic, yes it's sharp, reasonable contrast, but it's nowhere near as good as my 90mm f6.8 Grandagon, or my Super Angulons (65mm, 75mm, 90mm and 165mm) which all have that slight edge in terms of micro-contrast & sharpness.
So the Angulon will be transferred to a spare Wide-angle Speed Graphic, for workshop use.
If you want a cheap cheerful 90mm, that will produce your very occasional WA 5x4 images, and you don't need rise & fall etc then an Angulon is fine.
If you want more then a newer lens design is a must. Super Angulons, Grandagons, and the Nikon, Fuji, Congo equivalents will be far more flexible.
Ian