I see it as yours but recognize it as probably being read like the parents as not only is the default behavior for absense of evidence to treat it as evidence of absense or subtly of magnitude the fine distinction is lost on most.

It is anti-communication in context as cunningly putting effort into /not/ being clear. If they truly weren't sure a more honest form would be "We have neither confirmed nor denied the possibility of human to human transmission." (Putting aside any biological questions like are there even any crossspecies transmissions which cause propagative symptoms like coughing or sneezing but do not transmit through it.)