It might be an over-winter thing? The XLR won't even be flying here for another year and really won't build to significant numbers until 2026, assuming no more delays for Airbus (so let's say 2027?).

They could also be looking at demand and forecasting next year to be weaker, so will cut block hours. Both DL and UA won't be able to magically create demand, so they will be in a similar situation if that pans out.

The company offering zero time lines doesn't cost them anything so no real downside if they don't need the staffing.