I'm pretty sure this was covered on one of the many oil threads but I can't find it. I believe it's still defaulting on your user manual, which is requiring the Volvo spec oil, with Castrol being recommended. I'd call the dealer to be sure though.
If you read that wording several times, it's very weird. It seems to be a directive to Volvo service centers, not the customers. I interpret it as: Volvo will not reimburse the dealer for oil related warranty work unless the dealer uses 0W20 Professional V. Some dealers were still using the 5W30 Professional V and I imagine the dealer would eat the warranty cost if they still used it against this update.
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