We have Lucifer in the Mansions of Silence, actually erasing infinite universes with his presence, ON PANEL.
We have Lucifer tanking a multiversal level blast at point blank range, 3 times, including when he was severely weakened, ON PANEL.
We have Lucifer creating his own infinite multiverse in the void, with countless higher dimensions that dwarfed the worlds, ON PANEL.
We have Lucifer manipulating ALL time and space in ALL dimensions of two separate totalities simultaneously, ON PANEL.
We have Lucifer wiping an Eldritch being (of whom has leached off of multiple universes beyond DC, and not made by the Presence) out of existence with a thought, ON PANEL.
Regarding Scaling
We've seen his superiority to the Endless both stated and displayed, ON PANEL. Lucifer is greater than the Endless and everyone knows this. The Endless themselves have better feats than Beyonder.
Destiny holds the entire multiverse in his book. He sits outside of the orrery and straddles all of creation. He literally is the Destiny of the DC multiverse. He had no power in Lucifer's multiverse as Lucifer didn't create it with destiny in mind. The Basanos were blinded by Lucifer's will and his creation dimmed their power. Destiny has no hold on him, ON PANEL.
The shadow of the shadow of his book is powerful enough to control every universe in existence, known and unknown. Lucifer supersedes this power.
Both the narrative, Dream, Meleos, and Death herself tells us that Lucifer is greater than her. She can't directly claim him, yet she has the greatest feat of her siblings by claiming the entire multiverse, and one shotting her siblings in Books of Magic. She also casually one shots Dream with a touch in the Kindly ones.
Dream (Morpheus) himself admitted that Lucifer would destroy him in a fight, and Morpheus himself has recreated the multiverse twice, and retrowarped it so that the previous never existed.
Daniel Hall also recreated the multiverse in Sandman Universe and he is often considered inferior to Morpheus power wise. Lucifer outclasses them both.
Also (and people forget this) Lucifer is the creator of every star in the multiverse. We know this from his own arc. They are the result of his light-bringer power. In Overture, the stars were destroying the multiverse and were Even powerful enough to temporarily trap Morpheus. So yes, mere creations of Lucifer were destroying the multiverse.
And when people try to use Carey's tweet to lowball DC/Vertigo to universal, they ignore the SEVERAL times ON PANEL where Vertigo acknowledge infinite universes, infinite realities, multiple multiverses, and multiple infinities in both Lucifer and Sandman, last and more recent series.
That's why I don't argue with people anymore because it's a sheer refusal to accept the fact that DC has one of the strongest cosmology in fiction and marvel does not
Ask them what he has actually done ON PANEL that surpasses even the Endless? Not statements or hyperbole or invalid scaling. Ask them to show the multiversal destruction feat or multiple totality level manipulation feat.