Is my work writing reports for foreign entities—based on information I know to be inconsistent with reality and to involve falsification—considered a false testimony?

It is not permissible to affirm in reports what is known to be false and contrary to reality, as this involves acknowledging falsehood, participating in betraying trust, and speaking falsely (making a false statement). Az-Zur (falsehood) is a lie that is embellished and presented deceptively to appear as truth. Its characteristic is describing something contrary to its true nature.