Why not just make it obvious that they're looking at a modal on mobile? Remove the confusion rather than coding around it.
Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.
Hide child comments as well
Confirm
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Why not just make it obvious that they're looking at a modal on mobile? Remove the confusion rather than coding around it.