For those who know there is a facebook group called "The Vinnie Vincent Legion" and sometimes there are members from that group that make a post writing "A message from Vinnie Vincent" in which they basically are messengers sending Vinnie Vincent's message to everyone (to basically promote something or something else that Vinnie has to say).

This is weird, that Vinnie & his people send they're messages through people on this fb group just to let people know what he's up to.
I find this weird because Vinnie has his own official site on facebook and yet he doesn't post anything special over there, there's just a bunch of pictures of him in KISS, VVI and some other stuff.

Either way, why does Vinnie send messages through this fb group and not his own official fb site & his own website?
And are these "A message from Vinnie Vincent" actually his messages or is it just an impostor?

And how does he contact this people on this fb group to send his word out, are they employees of him?

Yes, for "plausible deniability" when needed or desired

Do you know who the people are that forward these messages? Vinnie has some people he uses, just wondering if it's them.

And as Slayer mentioned, it helps to distance Vinnie should things not work out, like has happened a few times.

One of the people that have send these "A message from Vinnie Vincent" as messengers have been Stepehen Wilkie and Roger Garrison, two guys that are members of the facebook group "The Vinnie Vincent Legion".

Both Roger and Steve are very closely connected to Vinnie

Yes, it doesn't make much sense, Vinnie may as well do it himself.

It's not like he can do a runner completely if things don't pan out.