That agent of Time Variance Authority in "Deadpool & Wolverine" invided Deadpool to the default MCU universe (Earth 19999 for general cosmology, or MCU's Earth 616), and the screens presenting scenes with Deadpool can be, at the same time as a joke, also a kind of foreshadowing for Secret Wars.
But something strange is that only Earth 10005 had the "Anchor" rumour, while it was all around the Wolverine himself, as the movie's metanarrative about how important Wolverine was to MCU, and then I have 3 hypothesis to answer that:
The Earth 10005 has an exclusive law of physics which defines their "anchors";
Or, as said before, it was only a reference to Wolverine/Hugh Jackman's importance to Marvel movies;
Or the Mr Paradox lied to try to fully convince Wade Wilson to go to Earth 616 for the Secret Wars, sacrificing his home universe.
This third hypothesis was based on Paradox having that universe-buster machine activated damaging the Earth 10005, but omitted it, lying that it was fading away because they lost the Wolverine, and that when Cassandra betrayed him she started to spread the energy to multiverse (Just to remember, immediately after this machine being destroyed the universe returned to normal).
