Since they argued against adoption of the Constitution, and lost, their position would not be regarded as authoritative as to the intent of the Constitution.
Yep. You have to pay attention to wade through some of the period controversies from the early Republic. You read (for instance) about Jefferson writing about separation of church and state, and then find he went to church in the US Capitol building. Not exactly what some folks expect.
Since they argued against adoption of the Constitution, and lost, their position would not be regarded as authoritative as to the intent of the Constitution.
AndyJackson
Most of the anti federalists argued against specific aspects of the proposed Constitution, -- not against the overall concept of a Constitution.
-- They were not anti constitutionalists, - IE, - they did not argue, [as some here do], - that States [under majority rule], can ignore our individual rights to life, liberty or property in the writing of laws.