You have very bad math skills.
Two decades=20 years.
If we’re using 40 ADP as the year for DF, then 40-20 is 20 ADP.
For the record: 20 ADP is when Warcraft III took place.
Also be aware that while early WoW and the first expansions (BC/Wrath) mostly kept the timeline on a parallel to the passage of time in real life (one year IRL used to equal one year in game), it was about the time of the Wrath>Cataclysm three year time skip that things started to get wonky. Since about the time of Cata or Mists, each expansion has actually been more like one year of time passing in game, which when you consider how much has happened is actually kinda ridiculous.
And looking at the timeline now? I honestly think they might have retconned the Cata timeskip. It was explicitly stated at the time that Cata started three years AFTER Wrath. That should have been about 31 or 32 ADP. Based on what I’m seeing on what I’m now looking up, Wrath was 27 ADP and Cata was 28 ADP.
While it’s not an official timeline, what’s up on Wowpedia apparently uses all official sources for the timeline, so it’s about as close as we’re going to get. I know for a fact that some of the years I’m looking at are NOT matching up with what myself and many others have been using for years at this point.
It also seems like Classic, BC, and Wrath are also being treated like they each only took a year now…
https://wowpedia.fandom.com/wiki/Timeline
Blizzard has always been bad about keeping the Warcraft timeline post WoW straight. Might be about time to give a definitive answer on the matter.
As for the timeline? Well, it’s even more ridiculous now. Apparently, the entire storyline of WoW from Classic to SL has only been ten years.
Anyway, off on a tangent. Going off what’s apparently the “official” timeline, Gilneas fell in the wake of Deathwing’s return in 28 ADP. If 40 ADP is when Dragonflight is supposed to be, that’s only 12 years.
Little longer than many of us originally thought as Cata was generally agreed upon to be 31 or 32 ADP following what was originally a three year skip, but the point remains: that’s still not 20 years.
I was kinda hoping for a world revamp coming into DF, but unless they surprise us in either 10.1 or 10.2 (which for all the mockery they rightfully get over 6.1 during WoD, a world revamp WOULD be a reason to declare it a major patch and not a X.X.5 update), I’m thinking we’re not seeing one now until 11.0 at the earliest.
Game desperately needs a revamp at this point. We’ve had post Cata versions of Kalimdor and the Eastern Kingdoms for longer than the originals at this point. It’s actually insane to think that they’re actually declaring a five year timeskip, yet the questing in these areas is going to reflect the world state from what will now be 12 years prior in universe.