I think we both have zero evidence to back our claims so I wouldn't read too much into it.
Two reasons come to mind: 1) This weekend's delays might get sorted, but the underlying cause is still there. It's just not a pilot walkout, but an overall lack of resilience in their workforce and infrastructure.
2) The holiday season is coming. Southwest is already stretched thin and is probably trying to gauge what kind of reckoning is waiting for them if they have to cancel thousands of flights during the busiest travel period of the year (and one where snow delays are a real possibility for much of the country).
That includes cancelled flights, which I had a lot of because I used to do at least weekly hops between two east coast cities (surprisingly staffing issues were almost as common as weather, but usually it was a combo -- eg weather causing delays in pilots arriving and then once the pilot arrives the weather is bad enough we can't take off.)
Always a survey, even if cancelled, 100% of the time.
This morning, Southwest sent me a customer satisfaction survey email with questions specific to flight delays. Seems like they are testing how much their brand was impacted by these problems, perhaps anticipating the delays will continue from worker action (that every denies)? If the problems truly were caused by some temporary issues that have been resolved, why would they bother surveying customers about it?