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I think the numbers are visibles only if you have color blindness

That's right. maushu even said it's a reverse color blindness test. If you can't see any of the numbers, then you likely do not experience red-green color blindness.

It's a completely broken test. The "correct" answers at the end indicate two-digits numbers for "plates" when only a single-digit answer was possible.

I, without color-blindness, can't make out any numbers. A coworker who is red/green colorblind also could not make out any numbers. Then the results, as I said, show that the whole process was broken from the start.

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