If he is interested in academic research (at universities or public research institutes) then I agree with your friends: he will need a PhD if he wants to progress to group leader, the pay is low and the contracts are fixed term (3-5 years at a time). This is a bit hyperbolic but I would actually only recommend it if you could help him get on the property ladder and possibly with child care costs in the future, because he certainly wouldn't be able to afford it for a good ten years out of university if he stays in publicly funded academic research.
I would also caution that progression very much depends on networking, you need to like giving talks, going to conferences, and in general sociable people do have an easier time with that (at least in the life sciences; I don't know about physical sciences). I think there used to be a stereotype of the lone genius / scientist about, but that really is just a myth.
In summary I would only recommend academic research if he really burns for it, and even then I would probably try to get out after the PhD.
By contrast, I think industry can be better-paid and there are also management roles in finance or in regulation / licensing (admission of new drugs etc.) that you can progress to out of the lab. These can be very lucrative and secure, but I don't know how you get these (maybe @JohnnyAndTheTaxDemand has some info). The graduate schemes mentioned sound like they would be a very good / safe way in.
Is he interested in pharmacy? I think the pharmacy degree is very similar to biochemistry and lots of pharmacy graduates actually end up doing research in the pharmaceutical industry (so it's not just your local chemist). Correct me if I am wrong @JohnnyAndTheTaxDemand but I think in industry, graduates of both these degrees can end up in the same kinds of jobs, but pharmacy may offer additional roles in hospitals, if that is of interest.
Finally, he could of course use the degree to get on any generic graduate scheme, if he decides lab work is not for him after all. There are also master conversion courses for computing, data science, psychology, law (does this still exist?) and some others, if he decides to change career into one of those directions later. Though that is a comparatively expensive choice (another year or two at university).
Maybe you said it and I missed it, but what were his A-level subjects? Is he interested in non-science degrees as well?