The attempted point being to measure and compare how people classify colors between blue and green when given a false dichotomy between the two.

But it cannot do that without bias, since people always have the third choice to drop out when they don't like their choices. There is also another bias, which is people will just select some random option when they want to say something equivalent to "blue-green" but don't have the choice, then they get a result biased in that direction but what has actually happened is they have given up. This random choice might be culturally biased towards people's preferred color. I personally selected green when that occurred for me and then just sat on green hammering that. Oh, I'm more willing to say green than other people? Meaningless, I wouldn't have called those colors green in a conversation.

When presented in a forum people also have the choice of criticising the false dichotomy which is what you are experiencing here. The point of posting it here is to get this sort of feedback, so...

OP's point is that this isn't valid because neither of the answers are correct. If you're really trying to measure a spectrum then the answers should allow for fuzziness. That is, you have a range/confidence interval of where green ends and where blue starts and in between is neither/both.

But that is wrong. This doesn't test colour perception or vision, it tests verbal classification of colour perception into a forced binary. Everyone could be perceiving the colour qualia 100% identically, but simply choosing different linguistic cutpoints, meaning you can't say this is about vision / perception at all (it may just be about language use).