Such executive agreements are not legally binding on the U.S.
They are binding on the US (they are binding under international law), they just aren’t always binding within the US on their own.
A Congressional-Executive Agreement is binding under the terms of the relevant statutory authority, and typically also is (and authorized by Congress as) the basis for binding regulation by the executive.
A sole executive agreement isn’t binding under domestic law on its own, but typically is implemented by being used as a policy guideline for executive action under other authority, or as a basis for the executive seeking supporting legislation (the latter of which may transform it, after the fact, into a Congressional-executive agrement.)
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They are binding on the US (they are binding under international law), they just aren’t always binding within the US on their own.
A Congressional-Executive Agreement is binding under the terms of the relevant statutory authority, and typically also is (and authorized by Congress as) the basis for binding regulation by the executive.
A sole executive agreement isn’t binding under domestic law on its own, but typically is implemented by being used as a policy guideline for executive action under other authority, or as a basis for the executive seeking supporting legislation (the latter of which may transform it, after the fact, into a Congressional-executive agrement.)