The references have prompted speculation that Apple may release Macs with AMD CPUs. At the moment, however, it's far too early to make that jump. As MacRumors points out, there hasn't been any corroborating evidence to suggest Apple plans to switch to AMD. In fact, if anything, it's far more likely we'll see Apple start to offer Macs which feature its own custom-designed chips. According to a Bloomberg report from 2018, Apple had planned to begin transitioning its laptops to ARM-based processors starting sometime this year.
More than anything, the testing likely speaks to how far AMD's Ryzen chips have come in the past few years. In 2019, AMD's desktop CPUs dominated Intel's best chips, and PC manufacturers have recently started to turn to the company for their processor needs. This past fall, for instance, Microsoft launched a 15-inch model of the Surface Laptop 3 that features a custom Ryzen processor the company co-designed with AMD.