It appears that Southwest has reconsidered, and is now adhering to their published policies. If you cancel a flight, you receive travel funds, but with the extended expiration date of June 30, 2021. If they cancel, for any reason, you will be offered travel funds with the extended expiration, but you may request a refund, and reports are that these are now being given.
EarlyBird Check-In remains non-refundable if you cancel, but will be refunded when Southwest cancels.