No, I think they are saying that the bonus action Shove is an attack. If it's an attack you must declare Reckless before you make the Shove even if the benefits of Reckless don't apply to Shove.
We know that you can "take the Attack action", bonus action Shove, and then make your Attack action attacks. The issue is that Shove is an attack and, therefore, requires Reckless declaration beforehand.
