I noticed it said that masks 'may be harmful' but if they showed any evidence for that claim I must have missed it.
Would be nice to see some evidence to back up that claim.

Also noted that although the article says these 'top European health officials' say they are not helpful and although the Danish health officials say that masks do not help it also noted that Denmark is now encouraging people to wear masks on public transport

Now just for a little info from the opposite claim
https://www.wsj.com/articles/face-masks-really-do-matter-the-scientific-evidence-is-growing-11595083298?mod=wsjtwittertest19

Face masks are emerging as one of the most powerful weapons to fight the new coronavirus, with growing evidence that facial coverings help prevent transmission—even if an infected wearer is in close contact with others.

Robert Redfield, director of the Centers for Disease Control and Prevention, said he believes the pandemic could be brought under control over the next four to eight weeks if “we could get everybody to wear a mask right now.” His comments, made in mid-July with the Journal of the American Medical Association, followed an editorial he and others wrote there emphasizing “ample evidence” of asymptomatic spread and highlighting new studies showing how masks help reduce transmission.