The deputy FM was responding to a comment/series of tweets from the Health minister who was himself responding to a softplay owner who was (understandably) pissed off that they had to stay closed, whereas other soft plays in different Scottish council areas will be allowed to open. Soft plays are closed in level 2 but open in level 1, and from tomorrow some of Scotland will move to level 1 and other parts will stay in level 2. As it is permitted in guidance and law for people to travel between level 1 and 2 areas, the owner pointed out that parents would just travel to use soft plays in different areas... The health minister tried to prevent this by pointing out that 10 children under 10 were in hospital in Scotland "because of covid" and such flagrant travelling would lead to "hospitalisation of children" (he initially said such "breaking of the rules" will lead to it, but then deleted the tweet, as he realised it wasn't breaking the rules, and might piss people off a bit...) . Parents were understandably concerned by this, so the deputy FM tried to calm everything down, while not admitting that the health minister was talking rubbish, and that the 10 children weren't necessarily there "because of" covid at all, and suggesting soft play would lead to mass child hospitalisation was a tiny bit scaremongery.
The RCPCH had to step in to point out that actually, the children in hospital with covid had it incidentally, and were not generally ill with it... But as covid prevalence rises in the community, and children are doing more activities, so breaking more bones etc, there will inevitably be a rise in the number of children with covid in hospital.
I'm not sure if this link to a tweet will work but it explains the story. So in terms of the effect of the delta variant on children it seems a non story and definitely not proof that child hospitalisations due to covid are "on the high side". In terms of government ministers telling outright lies to get people to behave in a way they want them to behave, it may be more of a story. But that's where we are, I suppose...