This article seems to make the argument:

Premise 1: There's this big problem of inequality

Premise 2: UBI is not a perfect solution for solving this inequality

Therefore, probably,

Conclusion: We should reject this solution

This is called Nirvana fallacy [0], also known as the perfect solution fallacy. For example: "Seat belts are a bad idea. People are still going to die in car crashes."

[0]: https://www.wikiwand.com/en/Nirvana_fallacy