How to Earn the Soultwisted Deathwalker Mount?

Earning the Soultwisted Deathwalker Mount is going to take some time and perseverance.
Patch 9.1, Chains of Domination, released on June 29, and with it came a new season. A new season means a new reward for Shadowlands Keystone Master. This leaves players to wonder how to earn the Soultwisted Deathwalker mount.
Previously, every season would require players to complete a +15 of every dungeon in time. Upon completion, this would reward players an achievement and a mount to go along with it. This time around, Blizzard has decided to change things up.
Two months ago, the popular Mythic+ rating system, RaiderIO, revealed a new Mythic Plus rating by Blizzard set to be used in the game directly. This means that players no longer will have to utilize RaiderIO and instead can use the one in-game.
The score will increase linearly rather than exponentially, which is different from the RaiderIO system. Time within the keystone is worth minor bonus points, with a big rating penalty if the timer is depleted. There’s a bonus of two key levels (15 points) worth of score available for each key players can do over a +10 level. Players will gain points on their best Tyrannical and Fortified runs.
How to Earn the Soultwisted Deathwalker Mount?
The aforementioned rating will be used to determine the Keystone Master achievement for this season. Players will require to have a score of 2000 points. Once players get 2000 points, they will obtain the Soultwisted Deathwalker mount.
Although not quite similar to last season, players will still be required to complete keys on time as not having completed them in time severely hinders their chances at higher scores.