Yes, the Snydercut of Justice League is real and it will be here in 2021. Zach Snyder released glimpses and clips in the week leading up to DC Fandome and we were finally rewarded with the trailer for his vision of The Justice League.
Zach Snyder began the Snydercut portion of DC Fandome answering questions about his direction, the vision, and process behind the push for the Snydercut. Fans created a vocal outcry after Justice League (2017) and have been signing petitions, making videos, and pleading with Warner Brothers seemingly to no avail, until this year. Warner Bro. Studios announced earlier this year that Justice League: ZS will release in 2021 only on HBO Max.