In reading through the article, it sounds like it's a piece of paper to acknowledge the loss of a potential pregnancy should a parent wish to do so. I think some parents who have had miscarriages would like formal acknowledgement of their lost (potential) baby.
It's also optional.
That said, it wouldn't take much to put in this framework then require women who have had abortions to obtain said certificate or for doctors to issue them.
Slippery slope IMHO.