I just checked, and Cuddlepie is an Australian resident.
Most people I know here are fairly well aware that both P plate drivers and professional drivers must have a ZERO blood alcohol reading at all times when driving. Even for "normal" drivers here, the limit is 0.05 (not 0.08 as I believe it is in the US and other places). Australian rules are pretty strict with BAC enforcement - even a whiff will have a teen (or truck driver for instance) detained, and taken back to the police station for further testing, and possible prosecution/loss of licence.
Given that, I would think the hosts should have mentioned that some of the foods contained alcohol - I certainly would have (and I have no kids, just in case that factors in). I'd mention to the teen to double-check in future, as it seems people may not think of it. Ultimately, he's the one driving, it's his licence and future.
*Just so others know, Aussies are legally able to drink once they turn 18, so it is definitely an issue with P plate drivers. Plenty of ads out there reminding people about it re. drinking and driving, and limits.