I think the point was that they all may be accessible under the same umbrella as they're all pretty intertwined. AMC owns Shudder. And as
@Legacy said, "Comcast has distribution rights for Channel Zero and Z Nation because they were developed for SyFy.".
Or in less messy wording:
SyFy is owned by Universal.
Shudder is owned by AMC.
Shudder hosts several SyFy properties on their platform.