"explicitly reaffirmed" is a correct and usable term in written English.
You can use it when you want to make clear that something has been re-affirmed in an unambiguous or unambivalent way, perhaps to emphasize the certainty of the reaffirmation. For example: "The mayor explicitly reaffirmed his commitment to social justice during the town hall meeting."
It is generally only when things are in doubt that they need to be explicitly reaffirmed.
The new constitution that Britain introduced for Gibraltar in 1969 explicitly reaffirmed Gibraltar's link with Britain while also granting it full internal self-government.
"The A's fail to mention that M.L.B.'s 1990 territorial-rights designation has been explicitly reaffirmed by Major League Baseball on four separate occasions," the Giants said in a statement.
This chapter is based on the proposition that the role of theory in the scientific enterprise must be periodically entertained, thoroughly examined, and explicitly reaffirmed by scientific practitioners.
To this we must add that for Carnap ramseyfications of theoretical terms can support only internal existence claims: he explicitly reaffirmed his confidence in the distinction between internal and external question to defuse the realism/anti-realism issue (1966 [1996, 256]).
In the last year, we've seen that message embraced at every level of government and civil society - and explicitly reaffirmed by all nations in Marrakesh after the U.S. election.
So he gave his famous speech to a group of Houston ministers explicitly reaffirming his commitment to the separation of church and state and declaring that his only loyalty was to the Constitution.
That uncertainty and mixed signals is a regular feature of foreign policy under Trump for instance, last month, when he declined to explicitly reaffirm that the US was devoted to NATO's mutual defense pact, alarming European leaders, he reportedly did so without telling his senior advisers.
Paragraph 5 d) of the Declaration explicitly reaffirms members' freedom to determine their own regimes for the exhaustion of intellectual property rights without challenge.
Paragraph 5b of the Declaration explicitly reaffirms the right of countries to "...grant compulsory licenses and the freedom to determine the grounds upon which such licenses are granted".
The Genocide and Torture Conventions, both of which Britain has ratified, state that any public official can be prosecuted.In addition, legal scholars argue that this lack of immunity has become "customary" international law, consistently reaffirmed for the past 50 years and recently restated explicitly in the statutes of the Yugoslav and Rwandan tribunals.
