There's some evidence, as explained in that article. It's just equivocal, as is the evidence in most COVID-19 studies, even the strong studies. Unlike most studies, though, neither the above nor the original study showing Manaus seroprevalence seem easy to dismiss. For example, the reinfection study notes that the elapsed time before the first wave and second wave was greater than the period of immunity established by other studies.

Definitely something to keep an eye on.