They don't mention it is "perfectly safe". They do mention it is safe based on what they observe from the camps. And they also mention there are risks that they feel are outweighed by the benefits of going to school. Which I interpret that as them considering it safe enough, and not perfectly safe.
There is nothing to interpret in the below quote.
Onderwijs op school kan perfect veilig gebeuren, schrijven de kinderexperten, kijk maar naar de jeugdkampen van deze zomer.
"Education at school can be perfectly safe, write the experts, look at the summer camps."
The fact that they then go on to say there is a risk, doesn't mean it removes their earlier statement that it is 'perfectly safe'.
It is the 'perfectly safe' statement that I have a problem with. It is false and dangerous.