They work for Peterson Tractor. Peterson Tractor is essentially a Caterpillar authorized dealership and Cat-authorized repair/maintenance facility, and participates in Cat apprenticeship programs, but they do sell and repair other-than-Cat products (and are "authorized" by those companies too, IIRC). Last I remember, the bulk of their business involved Cat machinery though.
But technically they don’t work for Cat – they work for Peterson. Peterson hired them, Peterson signs the pay checks... I'm pretty sure that's what they were referring to.