In plain English
FAR 52.225-6, Trade Agreements Certificate, is a solicitation provision prescribed at FAR 25.110, most recently dated Feb 2021. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 25.1101(c)(2), insert the following provision:
Prescribing reference: FAR 25.110.
The official text, verbatim
As prescribed in 25.1101(c)(2), insert the following provision:
Trade Agreements Certificate (Feb 2021)
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(a) The offeror certifies that each end product, except those listed in paragraph (b) of this provision, is a U.S.-made or designated country end product, as defined in the clause of this solicitation entitled "Trade Agreements."
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(b) The offeror shall list as other end products those supplies that are not U.S.-made or designated country end products.
Other End Products:
Line Item No. Country of Origin ______________
_________________
______________
_________________
______________
_________________
[List as necessary]
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(c) The Government will evaluate offers in accordance with the policies and procedures of part 25 of the Federal Acquisition Regulation. For line items covered by the WTO GPA, the Government will evaluate offers of U.S.-made or designated country end products without regard to the restrictions of the Buy American statute. The Government will consider for award only offers of U.S.-made or designated country end products unless the Contracting Officer determines that there are no offers for such products or that the offers for those products are insufficient to fulfill the requirements of this solicitation.
(End of provision)