Sorry about your bad luck Chris.
I wouldn't worry about Autoglass not finding the 400h listed, probably use error as the vehicle is sometimes listed as RX400h and at other times as RX 400h, or they only start listing it as a 2006 vehicle and they used 2005 in their search. There are around 11,000 400h on the roads so plenty to justify Pilkington or whoever to still make the glass. As they said, glass from the RX300/350 is the same.