I wanted to get an extension because I haven't received my refund yet and I opt to pay out of my refund

If you have already Efiled your return and are now waiting for your Refund, you don't need to File an Extension.

This is for those who are unable to file their tax return by April 15th.

Here's how to check the status of your Efile and your Refund:

https://ttlc.intuit.com/replies/3319882  

They might mean an extension for having the fees deducted from their bank account since the IRS hasn't sent the refund yet.