That feat actually is Pre-Crisis (it takes place when Hawkman and Atom and Green Lantern were all on the team together, so around the Seventies)... although what "pre-crisis" actually means anymore is in doubt...
It seems that pre-Crisis with post-Crisis continuity have merged, but it doesn't mean we should start using feats from Pre-Crisis Superman. Not yet anyway.
But as long as stories that happened in Pre-Crisis continuity are remembered by current Superman or in a situation like this one, imo, feats are still applicable. Similar to how many things introduced in the Byrne era have been retconned, but many events during that period are still in continuity.
Three feats from Superman: Beyond should be in here.
1). Apparently Superman's origin story is so incredibly moving and powerful, it can create a competing narrative with which to combat absolute nothingness (I'm still not even entirely sure what it means, but it sounds unbelievably incredible).
2). Superman is literally the living embodiment of the concept of the Superhero, and the "idea" of him is even more powerful than any of his constituent super-powers.
3). Superman showing that the Monitors were misinformed. Apparently, Multiverse-level beings that can destroy universes with a thought are not the only individuals that can bottle or carry bleed; Superman can.
None of that was precrisis the entire universes were rebooted with their entire histories generated,otherwise people who casually travel time all the time would have noticed that shit hit the fan 20 years earlier,waverider had to go to the linear mens headquarters to find out about the crisis,hal had to go directly into the timestream ect ect.
Whats funny is superman did that planet pulling pre infinite crisis upgrade so I guess we finnaly have a legitimate no one can argue against case of superman being able to generate planet destroying power(since it takes much more power to pull a planet weight against the suns gravity+starbreakers power).
My personal favorite theory is that Superman is literally capable of doing anything, regardless of how much solar energy he's soaked up, and that the whole "Solar Battery" thing is just his way of rationalizing it.