While like most of the commenters here have pointed out, this should be treated with a healthy amount of skepticism. However, it is a small glimmer of hope - akin to water in the desert, for gamers who do actually use macOS for work and then don't have the budget for another 3,000$ gaming computer alongside their workstation.
For years we've dealt with computational / rendering GPUs instead of gaming GPUs. If Apple started to support NVIDIA cards again or even have a low-end CPU high-frequency GPU option to keep the price down (which is what all of the consumer gaming machines are doing, and a glaring hole in Apple's lineup) with a small amount of RAM (32 GB or so) - presto, 1,000-3,000$ gaming computer with an Apple logo on it that can blow gaming benchmarks off.
It is also exciting from a software support standpoint. When Apple wanted developers to adopt Metal for workstation applications (their bulk market) they went out and sought major developers for support to get a healthy ecosystem going. I can easily see them going to Activision, EA, and other gaming companies to get them to commit to writing mac ports that are as high quality as Divinity 2: Original Sin was from Larian.
Anyways, it's good news all around. Naysayers here have posted "well it's cheaper to build your own..." well of course. It's also cheaper to build your own Windows machine than to buy a Windows gaming machine from any OEM like Dell (Alienware). The bulk of gamers try to save money, but some gamers don't have the time or energy to build their own - and take the path of least resistance for a few extra dollars. That is the market Apple is supposedly targeting. Let it happen.