In plain English
FAR 52.252-1, Solicitation Provisions Incorporated by Reference, is a solicitation provision prescribed at FAR 52.107(a), most recently dated Feb 1998. 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 52.107(a), insert the following provision:
Prescribing reference: FAR 52.107(a).
The official text, verbatim
As prescribed in 52.107(a), insert the following provision:
Solicitation Provisions Incorporated by Reference (Feb 1998)
This solicitation incorporates one or more solicitation provisions by reference, with the same force and effect as if they were given in full text. Upon request, the Contracting Officer will make their full text available. The offeror is cautioned that the listed provisions may include blocks that must be completed by the offeror and submitted with its quotation or offer. In lieu of submitting the full text of those provisions, the offeror may identify the provision by paragraph identifier and provide the appropriate information with its quotation or offer. Also, the full text of a solicitation provision may be accessed electronically at this/these address(es):
_____________________________________________ _____________________________________________ _____________________________________________ [Insert one or more Internet addresses]
(End of provision)