Is working for a European charity that practices hypocrisy, lies, claims independence, and informs officials of the details of those in need, leading to a subsequent deduction of their social assistance, forbidden by Sharia?

It is not permissible to lie to people and deceive them. If your work involves that, then it is forbidden. However, if you are not engaging in these blameworthy acts, then there is no blame upon you, as delivering aid to those who deserve it is a commendable act.