Not the original commenter but I am in the industry, and its true, many satellites shut down during this region over the South Atlantic.

For that reason, it is not a popular orbit unless there is a larger driver behind the selection. For example the ISS goes right through it in order to be above Russia for a reasonable portion of its orbit. I believe Astronauts have reported increases in optical flashes during this part of the orbit as more energetic particles pass through their eyes.

I'm not the commenter you're repling to, but personally I think I originally learned about the SAA from a Scott Manley video.

I'm not in the industry. Just a fan of anomalies.