They also mixed up the price of the original Fang Lair mount with the Ashen one.
Like listed there on ESO Fashion the Fang Lair one was previously 3,000 Crowns while the Ashen one was 3,500 Crowns.
They currently have the original Fang Lair one listed in the Store at 3,500 Crowns with a discount to 2,800 IF you're an ESO+ member..

Edited to add:
@ZOS_GinaBruno @ZOS_Kevin if anyone could look into this?

Araneae6537 wrote: »

I’m confused on this too. Was the Ashen Fang Lair Courser part of a one-time or package-deal-only or on its own? Or has it yet to come out? I like the magical smoke effect if that will match my necro’s reanimated dragon pet!

The Fang Lair Courser was in the Dragon Bones Collector’s Bundle. (source: here )
It was paired with the Small Bone Dragon Construct pet, but you could buy them separately like you can with all the DLC Collector's Bundle mounts/pets during the duration of the patch the DLC Dungeon came out.
If you bought them separately it was 3,000 Crowns for the Fang Lair Courser and 1,000 Crowns for the Small Bone Dragon Construct, or you could get the bundle for 4,000 Crowns that came with the pet, the mount, and the two Dragon Bone DLC dungeons. (Scalecaller Peak and Fang Lair.)

The Ashen Fang Lair Courser came out sometime shortly after at a higher price of 3,500 Crowns and they even had the Unholy Glow Bone Dragon come out the same time too which was 1,500 Crowns. Those were back in April of 2018 (source: here )

I mean, they fixed the launcher to show the correct horse now, the Fang Lair Courser, buuuuuuuuuut they never did drop the price down to what it was originally... oof