In plain English
FAR 52.215-3, Request for Information or Solicitation for Planning Purposes, is a solicitation provision prescribed at FAR 15.209(c), most recently dated Oct 1997. 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 15.209(c), insert the following provision:
Prescribing reference: FAR 15.209(c).
The official text, verbatim
As prescribed in 15.209(c), insert the following provision:
Request for Information or Solicitation for Planning Purposes (Oct 1997)
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(a) The Government does not intend to award a contract on the basis of this solicitation or to otherwise pay for the information solicited except as an allowable cost under other contracts as provided in subsection 31.205-18, Bid and proposal costs, of the Federal Acquisition Regulation.
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(b) Although "proposal" and "offeror" are used in this Request for Information, your response will be treated as information only. It shall not be used as a proposal.
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(c) This solicitation is issued for the purpose of: ___________________________ [state purpose].
(End of provision)