Also, why would a landing briefing be given during the initial climb? This is a time to be on the lookout for any pressurisation problems etc, closely monitoring leveling off etc, certainly not distracting attention away from these essential monitoring roles with a landing briefing.
How could they have listened to the destination ATIS to determine runway in use and expected approach, specific local WX etc to be able to give a detailed and full brief by this stage of flight?
Nothing to it, Pilot Mike, especially in aircraft that like climbing until Top of Descent. In fact, waiting until you level off (with a short cruise segment) until you start preparing for the arrival is increasing the pressure.
Don't read too much into the tea leaves...