Native communities should avoid the Johnson & Johnson COVID-19 vaccine for now

The study results for the third COVID-19 vaccine, a single-dose vaccine from Johnson & Johnson was good news for nearly everyone—but not for American Indians, nor Alaska Natives.

The results are conclusive for lack of protection by 28 days after a dose for these two groups, who should avoid this vaccine for now and stick to the other two-dose (first and booster) vaccines.

Why is that true? Why haven't the US FDA and others said so?

https://indiancountrytoday.com/opinion/native-communities-should-avoid-the-johnson-johnson-covid-19-vaccine-for-now