In Chapter 1064 we see Pudding is held captive on one of the Blackbeard Pirates’ ships. Pudding tells to grunts that if Big Mom is still alive, they wouldn’t be acting so cocky, but they tell her that she is dead and they are fighting her killer, meaning that the new era is still being made.
Does that mean Big Mom is dead? Not exactly. Let’s go back to the Germa cover story:
The first cover shows Germa leaving a WCI full of smoke, next chapter is where we see Judge sighing.
This right after the end of the Whole Cake Island arc and they are close the the island, obviously there is some time between the end of the arc and the beginning of the cover story since we see that Big Mom came back from eating the cake and beat the Vinsmoke brothers up but it’s a day or two at most seeing how Cracker/Katakuri are bandaged.
Oven/Brulee take the brothers to Whole Cake Island through mirrors, while Kuzan and Augur invade Cacao Island then kidnap Pudding.
We can fairly assume that transporting the brothers, Ichiji/Reiju who are close to Whole Cake Island liberating them and the kidnapping all happens in the span of the same day.
So overall between the end of Whole Cake Island and the kidnapping less than 3 days pass, let’s say 5 to be generous.
Why does this matter to what Pudding says about Big Mom? She has no way to tell Big Mom’s status on her own.
Big Mom’s children are not allowed to carry part of her Vivre Card.
The exceptions to this are Lola who’s a runaway that Big Mom doesn’t consider her own child anymore and Perospero who from this alone seems to be the second in command on the ship at that time.
The exception makes the rule, and so far we’ve seen two children out of 85 carrying one outside of Totto Land, no one had one inside.
Pudding, the 76th child, has no real command in the crew so her importance in general seems pretty low compared to her siblings, her eye is literally the only thing that makes her important, it can be assumed that she has no Vivre Card on her.
So in conclusion, Pudding has no Vivre Card on her and her kidnapping happens way, way before Big Mom’s defeat which happened two weeks after the Straw Hat arrived to Wano so all her information comes from newspapers.
As far as the readers are concerned, Big Mom’s status didn’t change. It’s still unknown.