Bolsonaro wanted to achieve herd immunity by having most Brazilians catch Covid-19, rather than by vaccinating most Brazilians.

The article errs by using the term "herd immunity" only for the first option. Both recovery from an infection and vaccination convey the same sort of immunity; a sufficiently large fraction with immunity from whatever cause results in herd immunity.

Where they differ is that catching Covid-19 can result in death, or in lasting disability (perhaps permanent) in a few percent of the infected people. Vaccination does not do this.

Out of 200 million Brazilians, letting the disease run rampant may imply a few million dead and a few million disabled on the path to herd immunity.

This is why it makes sense to use various methods to reduce the fraction of people that ever catch Covid-19.