Outputtext not binding to record when rendering as pdf attachment

Here's the code I have for the Apex Class:

public class attachPDFToBPA {
    private final BPA__c b; //BPA object
    //constructor
    public attachPDFToBPA(ApexPages.StandardController standardPageController) {
        b = (BPA__c)standardPageController.getRecord(); //instantiate the BPA object for the current record
    }
    //method called from the Visualforce's action attribute
    public PageReference attachPDF() {
        //generate and attach the PDF document      
        PageReference pdfPage = Page.BPAdemo; //create a page reference to the pdfDemo Visualforce page     
        Blob pdfBlob = pdfPage.getContentAsPDF(); //get the output of the page, as displayed to a user in a browser 
        Attachment attach = new Attachment(parentId = b.Id, Name = 'pdfAttachment.pdf', body = pdfBlob); //create the attachment object
        insert attach; //insert the attachment
        //redirect the user
        PageReference pageWhereWeWantToGo = new ApexPages.StandardController(b).view(); //we want to redirect the User back to the BPA detail page
        pageWhereWeWantToGo.setRedirect(true); //indicate that the redirect should be performed on the client side
        return pageWhereWeWantToGo; //send the User on their way
    }
}

These are the Visualforce Pages:

<apex:page standardController="BPA__c">
<h1>Here's a copy of your BPA</h1>
<p>Thank you, <b><apex:outputText value="{!BPA__c.BPA_Signer__r.Name}" escape="false" /></b>, 
for joining Our Network!</p>
<p>BPA Signed Date:&nbsp;
        <apex:outputText value="{0,date,long}" >
        <apex:param value="{!BPA__c.BPA_Signed_Date__c}"/>
        </apex:outputText></p>
</apex:page>

<apex:page action="{!attachPDF}" extensions="attachPDFToBPA" standardController="BPA__c">
<!--
    Notes:
        - Visualforce page for creating a PDF file and attaching to BPA record
-->
    <apex:pageMessages ></apex:pageMessages><!-- included for display of errors should they occur -->
    <apex:detail inlineEdit="true" relatedList="true"></apex:detail> <!-- included so BPA detail information is visible when errors occur -->
</apex:page>

And this is the generated pdf attachment, missing values: