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Oh yeah, all those would be allowed. The idea isn't "ignore all things that have any branding effects" it's "ignore this one thing (college degrees) that is especially costly for people, in both $ and opportunity cost, and has an especially low ratio of value-to-branding signal"
That's a very interesting abstract criterion for exclusion: "low ratio of value-to-branding signal".
Also per @robinhanson the hard-to-fake signal is "I conform". Companies value this, so they'll find another way to discover it, which will encourage applicants to do more of that. If you make signaling cheaper, people just do more of it.
Of course, there seems to be an assumption embedded into this that college is more more importantly a signal than a treatment. Or at least that college is a noisier signal than, say, previous employment - which I'm not sure we can just handwave away...
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