"I do have concerns about them using ingredients like vitamin C, vitamin A (retinoids) and exfoliating acids like AHAs and BHAs."
As someone who's 'into' skincare, it also happens that the ingredients mentioned are also amongst the best treatments for blackheads, spots, sebaceous filaments and other assorted teenage/hormonal changes skin issues - I suspect this article is not about ageing, but about "youngsters" being more educated about what they need!
Vit C has also been shown to help boost spf's, so is something recommended to anyone at any age (if your skin 'gets on' with it).
This is a stupid article, as Guardian subscriber I'm very disappointed, it's a 'nothing' article that I'd more expect of the Mail!
He's done this before, and you haven't made a complaint???!
Passing snuff movies around is disgusting - IANAL but I would suggest that at minimum it would be Gross Misconduct and, probably, highly illegal and he should be immediately dismissed and possibly arrested.
However, I'm not a lawyer so I would contact ACAS ASAP, see https://www.acas.org.uk/ and log everything, inc. previous videos he's sent around - don't delete your evidence! But ACAS will advise you best.