As far as I know the warranty is 5 years + 6 months from the date of purchase of the device by the distributor from Victron.
No matter of the production date.
That way the distributor has 6 months to sell the device to the end user and the end user still gets 5 years warranty.
And normally that’s working out pretty good.
Form some products with a very low demand we sometimes get units with HQ23XX from Victron but from most products with a higher throughput (like the IP22 chargers) we normally don’t get units that are produced more than 3-4 months ago.
I highly doubt that your device has been bought from Victron in the past 6 months.
It’s more likely that it was laying around for a few years and the warranty is almost over.
This is also described in the warranty policy:
So your caution with that current issue will probably backfire in therms of the warranty.
It would have been better to wait for the new improved batch instead of looking for an old one.