In plain English
FAR 52.222-30, Construction Wage Rate Requirements-Price Adjustment (None or Separately Specified Method), is a contract clause prescribed at FAR 22.407(e), most recently dated Aug 2018. 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
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 22.407(e), insert the following clause:
Prescribing reference: FAR 22.407(e).
The official text, verbatim
As prescribed in 22.407(e), insert the following clause:
Construction Wage Rate Requirements-Price Adjustment (None or Separately Specified Method) (Aug 2018)
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(a) The wage determination issued under the Construction Wage Rate Requirements statute by the Administrator, Wage and Hour Division, U.S. Department of Labor, that is effective for an option to extend the term of the contract, will apply to that option period.
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(b) The Contracting Officer will make no adjustment in contract price, other than provided for elsewhere in this contract, to cover any increases or decreases in wages and benefits as a result of-
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(1) Incorporation of the Department of Labor’s wage determination applicable at the exercise of the option to extend the term of the contract;
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(2) Incorporation of a wage determination otherwise applied to the contract by operation of law; or
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(3) An increase in wages and benefits resulting from any other requirement applicable to workers subject to the Construction Wage Rate Requirements statute.
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(End of clause)