If W(U1,…,Un) cannot be coherently constructed from ordinal inputs alone, the Bergson-Samuelson framework presupposes interpersonal comparability whether or not they acknowledged it.

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Bergson-Samuelson framework(as used in welfare economics and social choice theory): A mathematical approach to studying social welfare (how well society is doing overall) developed by economists Kenneth Borch and Paul Samuelson that tries to avoid making direct comparisons between different people's happiness.
Interpersonal comparability(as used in economics and ethics): The ability to measure and compare how well off different people are—for example, knowing whether Person A is happier or worse off than Person B.
Ordinal inputs(as used in economics and decision theory): Information that only tells you the ranking or order of things (like 'A is better than B') without measuring how much better they are.
Presupposes(as describing what Plantinga's argument takes for granted): Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.

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