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What do you define as diverse? You wouldn't call a diet that consisted of 90% rice and beans, and 10% whatever else diverse. As opposed to a diet that consisted of 25% rice, 25% beans, 25% leafy greens, 25% meat.
Currently the diet is 25 grains of rice, 25 chopped pieces of beans, 25 leaves, and 25 cows. Unhealthy? Likely. Unfair? Definitely. The current bill tries to go closer to fairness by weighting based on population. What if there are only 3 countries in the world, US, Lithuania, and Rest? Would you want 50 Lithuanians and 50 rest and call it diverse?
It's backwards to think this is better for the people who are trying to get in from places like Europe or Canada, or even parts of Africa. They're now at the back of the line behind India and China. Nothing about this bill promotes fair diversity, or even diversity itself. Unless you explicitly measure diversity in quantity of melanin in their skin which is racist itself.