Not really. The drivers for the 5 and 6 series have been open sourced/published for a long time now. AFAIK nobody uses the open source drivers for anything. While it's nice that they exist, the open source drivers are lagging behind AMD's drivers by an order of magnitude. So yeah, the "poor job" AMD does is still about 5X more effective than the open source drivers.
Maybe writing drivers isn't as easy as the average geek on a message board seems to think, and the open source community actually isn't better at it than the paid team at AMD...
The open source drivers of past were made by open source community NOT by AMD. This is AMD releasing drivers for Linux, otherwise it wouldn't even be newsworthy.
EDIT: Actually it might be this was not really newsworthy, but AMD making some updates to the open source drivers which has existed. The article is not very clear on this ...