Using example of the forged card - model comes equipped with 4 Molotov cocktails so if there is 4 Forged models their unit should have 16? If yes can they all share this number or it should be counted separately?
That is currently correct, yes.
TBH, most of us use models singly here and don’t use the sharing rule, and four molotovs is possibly a bit much (you may end up paying for them and not using them in all honesty, depending on how violent games get).
But RAW, if it says you get four, that’s four per purchase of a Forged body.