The number of mentions about Apple providing the service "for free" makes it sound like the author perhaps actually charged their elderly friend, and honestly that would be a huge violation. I don't know exactly what the author's job was (can't find it on the site), but if their job is servicing Macs, it's very normal for their employment contract to forbid making money servicing Macs outside their job -- it's literally having your own employees compete with you.
But if the author didn't charge... then there's got to be a separate "real reason" they were fired.