Paper unknowingly describing technical bias as if it was a biological phenomenon of interest
You have to live with the fact that academia is an imperfect system like any else and scientific knowledge underlies evolution. Seeing the bigger picture, in the long term journals that don't allow or implement criticism/replies on their journals papers will likely vanish. 

Your (very hypothetical premise) is simply very wrong that you have to find a way to correct wrong/bad content (in your opinion) in every journal.

Technically, this is the same answer as Wolfgang gave, but from a bigger different perspective.

You can also see it like this: Scientific reports doesn't believe that in the long term negative comments on their articles help to avoid more the publication of falsehood than for other journals or just creates "editorial noise/extra-work" (unworthful extra-work probably being the main reason to not offer this option). Do you rememeber facebook offering a downwote button, now it's gone. Or look at stackexchange, upvote +10, downvote -2 karma. When you have scientific branches like biomed/psychology in which over 70% of studies cannot be reproduced, it's questionable if article replies overall and in the long term have much value as this evolution is driven mainly by affirmation, reproduction by other groups instead of scientific discussions in a journal, as the system to create true new scientific knowledge works differently, less efficient and theoretical than in branches like mathematics or physics, which is not surprising if you have a bit of interdisciplinary methodological knowledge.