That's not really surprising at all. The article says the category of workers in "gig" type of jobs went from 11% in 2005 to 10% in 2017. To change this number

That's not really surprising at all. The article says the category of workers in "gig" type of jobs went from 11% in 2005 to 10% in 2017. To change this number above some level of statistical significance, people would have to move away from salaried work to gig jobs en masse or vice-versa, but that's not really how skillsets and careers work. You don't wake up one day and say: "geez, I'm going to stop being a lawyer and go drive for Uber to spend more time with my kids". It is much more likely that a person flipping burgers somewhere might try being an Uber driver and that an Uber driver somewhere else might get fed up and end up going back to one of the low-skill alternatives (flipping burgers, retail, etc) at roughly equal rates.