Young, unvaccinated, over 50 or just had one dose? You’re most at risk from the Covid delta variant

This has got to be one of the stupidest headlines I've seen in a long time. Either they've screwed up their syntax, or this means everybody is most at risk. Let's break this down:

Who is most at risk?

1. The unvaccinated
2. Everyone over 50
3. Everyone who has just had one dose

Isn't that essentially everybody except those under 50 who have had both doses? And doesn't this explicitly imply that everyone over 50 is most at risk even if they're fully vaccinated?

The article itself is not much better:

Number crunching the latest data from England, 92,029 cases were analyzed between early February and mid-June and were attributed to the delta variant.

Almost 82,500 of these total cases were recorded in people under 50 years old and a majority (53,822 cases) were found in unvaccinated individuals.

Among those cases in the unvaccinated cohort, the vast majority were in the under-50 age group (52,846 cases) and only 976 cases were in the over-50s. (emphasis added)

First of all, could it be that a majority of people under 50 are unvaccinated, and without that figure, stating that, "...were recorded in people under 50 years old and a majority (53,822 cases) were found in unvaccinated individuals" is meaningless if it turns out that a majority of that group are unvaccinated to begin with. They write this to imply that these people under 50 got the virus because they were unvaccinated, but that's not sound logic, not without more data.

Also, could it be that this strain prefers young people rather than, as I think the article is trying to imply, younger people are getting it because they're less likely to be vaccinated? The whole article is a mess of useless information.