Oh, come on. They certainly are not. Pick any rapidly growing car model of the last six or seven decades (the Prius in 2005-08 comes to mind, Outbacks in the 90's, etc...) and you'll discover a flood of service problems reported.
Tesla is having trouble scaling service because it turns out service might be harder to scale than factories.
And one way you address that is by hiring more people to do service, which is exactly what is being reported here. The idea that these are "untrained" (!!!) employees is pure spin. These are, fundamentally, new employees, brought on[1] to service cars. And, duh, they're going to have to be trained before they can be useful. There isn't the remotest hint of an allegation anywhere in that article that Tesla was skipping training for service employees. It's all spin.
Anti-Tesla headlines are an eyeball magnet. There was one going around a few days ago about something like 300 autopilot accidents had been identified by the NTSB (or NHTSA?), failing to note that if that holds up it represents an accident rate something like 6% of the average passenger car.
[1] Albeit as transfers from other departments.