It doesn’t add anything meaningful to the discussion. Basically everyone is aware of those arguments. The top level comment states some facts (e.g. climate change), but does not offer deeper insight or start a discussion. Nothing was gained from reading that comment, so it may as well not have been written in the first place.
In order to turn it into a meaningful contribution the author of said comment should have added something more.
For example by going into how they feel those facts are insurmountable and therefore how they see the demographic changes as inevitable and what sort of effects this will have on their personal life/on their community/on their country. This can then lead to a discussion about the severity of the effects and people can contribute what they think possible solutions are.
Or for another example, one could use these effects on demographic change as a basis to start a discussion about one of the contributing factors. i.e. take the difficulties that arise from lower birthrates as an argument for better family oriented policies/for more climate action/against bodily autonomy (that one would certainly start a fierce discussion, lol)