One problem with the "media release" is that it provides no link to the actual article, and no detail of the research.
it shows studies where they tracked multiple metabolic and endocrine markers ,
Or also Melatonine, but nothing about "gene activity". In their latest paper:
Nineteen healthy, young, normal-weight men were randomised to either sleep restriction (habitual bedtime minus 1.5h) or a control condition (habitual bedtime) for three weeks. Weekly assessments of insulin sensitivity by hyperinsulinaemic–euglycaemic clamp, anthropometry, vascular function, leptin and adiponectin were made.
You could hardly expect the subjects to have adapted to a new pattern of sleep in that time. It's not clear how many control individuals there were, or if people who already sleep say 5h were used.
The part about gene activity seems absent ... unless it's a different paper, or the insuline sensitivity / vascular function is taken as a proxy ... but that's unlikely.
Anyway, not much can be inferred from the press release.