Writer of the article didn't know this bit of lore 15min before writing the article... Must be a slow news day...
OP misrepresents the article as some of stance by Wargamer... What else is new...
PDK is a 1000+ year old organization, things change in that time. The Lego company started with wooden toys 90+ years ago, these days it's plastic bricks instead of wooden toys. Why can't PDK have formed an alliance with Amethyst Dragons? Do I like that? Don't know, not much is known at this point if it's a development or a retcon. But I do know that a Black Dragon != Amethyst Dragon.
I didn't like the fluff jump of 3e to 4e with 100 years, and while the jump from 4e to 5e was far smaller, it wasn't much better imho. I like the gradual progress of a world, like 2e to 2e revised, even to 3e was nice and all. But WotC wanted a LOT of change with 4e and 5e suffered from those changes as well and then added some more to them. Too many chained world shattering events makes it feel less and less like FR. Shadowrun suffered from that as well after the first few editions. Change for change sake so they could sell more books and/or the writers wanted to create their own version of an established setting...
Don't get me wrong, I had issues with Time of Troubles as well, back in 2e! But that was one event, fine done, we can kinda ignore that, 100+ years worth of those events is not easy to ignore.