After reading the comic, I don’t think it confirms Snoke is a canon version of Luuke.
It certainly implies something will be made with that hand later on, but whether that’s Snoke or something else is unclear.The comic takes place shortly after ESB, so those fully grown Snoke-like creatures (strandcasts?) being already so big and conscious after, like, a week (?) seems a bit far-fetched. Palpatine was probably already at it before he got the hand, then took it for other purposes.
I suspect, regardless of the comic, Mandolorian will eventually just explain Snoke as a genetic failsafe experiment from Palpatine’s will. Some Empire admiral will be enacting it as part of his “If I die” orders.