Welcome to Flyertalk. Both statements are true because Thank You offers more than one method of redemption.
Go to this page...
https://www.thankyounetwork.com/faq.jspx
Click "Travel Rewards" and read everything. Item 2 explains the difference between Fixed (25,000 point) and Variable (cost based) awards. Item 5 explains how airlines not available through Expedia are handled.
That is a very helpful link and website. There should be more information published by citibank telling people about this website. I mean posted obviously and prominently where people could find it easily.