Post Covid (and its difficult to tell what the long term or short term plans were) its true that the QFLink B717 fleet stopped a lot of flying, and during and after Covid the B717 fleet was parked up a lot of the time and went from high utilization to lower utilization, the Alliance operated E190s went from low utilization to very high utilization as soon as they arrived in the country.
Not many Q400s parked up during or past Covid as a lot of them were on intra-state routes and thus not really affected by Covid state border closures i.e. they never really stopped flying.