is this the official twitter account of andy sixx?

No that isn't Andy twitter account,but since it says Not Andy it's not someone pretending to be him.
link this is what tu want.

YES! thats his official twitter.

Yes, it is. o was, anyway. He actually changed it to @AndyBVB a while ago...

if tu noticed it dicho "NOT ANDY" nest to the name, so i would guess not.

No