It's clear that the author interpreted the data that way, yes. And perhaps the shop actually charges the same for brakes whether it is an Ford F150 or a Toyota

It's clear that the author interpreted the data that way, yes. And perhaps the shop actually charges the same for brakes whether it is an Ford F150 or a Toyota Corolla. But that seems very unlikely to me. While they're both very common vehicles, they are also very different and the parts have substantially different costs associated with them.