I'll be honest, my default perspective is to expect filibustering and non-answers from all but the actualized and self-aware teams, who if reading this thread and many, many others like it, and lived experience are anything reliable: are less common than their frustrating counterparts.
You can use that to make your decision then. Both filibustering or a non answer in this case are as good as a negative answer for what you want to figure out with it.
Nothing wrong with asking the average tenure of people on the team imo, that is something you can frame in a way less likely to make them lie.