You are correct. If there were a requirement to attach a PDF to your return TurboTax would prompt you for that upload. It is only in rare instances that a PDF is required. Since there is no requirement for a separate signature page in this case there will not be a prompt.
Your options are to e-file as is which meets the requirements in Revenue Procedure 2019-38 with your electronic signature on the return and be done or print/mail your return and also sign the statement page in that package.
According to the instructions you are not not mail in any forms separately that are not on the form 8453.
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