The Blood Hunter is listed as an additional class on D&D Beyond, was it made official?

You can download Blood Hunter class here:

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ESSENTIALS KIT: 3 Official Adventures that continue the story!

Storm Lord’s Wrath
Abandoned for many years, Leilon was once a fortified settlement midway along the High Road from Waterdeep to Neverwinter. Under the paid service of the Lord Protector Dagult Neverember, citizens of Neverwinter have returned, intent on reestablishing LeiIon as a safe waypoint once more. Unfortunately, followers of Talos have also arrived, and they’ve brought the weather with them.
A D&D adventure for 7th-level charactersLink

Sleeping Dragon’s Wake
Despite the depredations of those in the service of the Stormlord Talos, citizens of Neverwinter continue their work to rebuild the town of LeiIon and reestablish it as a fortified waypoint on the High Road betwixt Neverwinter and Waterdeep. However, to make matters worse, a cadre of villains devoted to both Myrkul, god of death and the Cult of the Dragon, have risen from the Mere of Dead Men to strike out as well.
A D&D adventure for 9th-level characters – Link

Divine Contention
The ghosts of the Swords of Leilon have returned to bring warning so you might protect their beloved town and prevent two great evils, both competing for the same prize, from wiping it from the Sword Coast once more. You must enter the Ethereal Plane, prevent the followers of Talos and Myrkul from gaining possession of an artifact of great evil, and put down the forces of not one, but two vile deities.
A D&D adventure for 11th-level characters – Link

Top 10: Fighter Subclasses 2020 – DnDBeyond