I think you are reading in a requirement that just isn't there. These clauses can also be harmonized by considering FAR 52.222-41(c)(3), which states:
This is not conditioned on attaching a new wage determination to the contract. The adjustment is conditioned on the length of the contract and the issuance of wage determinations by the Wage and Hour Division subsequent to the original contract award. I think a more harmonious interpretation of paragraph (c) is that the wage determination attached to the contract document applies upon award, but is subject to later adjustment upon the occurrence of the conditions stated in (c)(3).
I haven't researched it, but your interpretation may also ignore paragraph (b), which states:
Are these statutory and regulatory provisions predicated on the contracting officer modifying multiple year contracts to attach updated wage determinations?