I work on fuchsia and can honestly say I have no idea what you're talking about. Fuchsia and android are more complimentary than they are competitive. I've noticed that when there is a lack of information, people tend to invent things that fit their narrative, but that's a really dangerous habit.
And from 9to5google.com Work on this Fuchsia project within Android — dubbed “device/google/fuchsia” — stalled in February 2021, with no public indication of how things were progressing. This week, all of the code for “device/google/fuchsia” was removed from Android, formally signaling the end of this particular avenue.
In its place, we have a lone “TODO” message, suggesting that Google may be building up something new in its place. The developer responsible for the change primarily works on Fuchsia’s “Starnix” project.
First shared in early 2021 as a proposal, Starnix is designed to make it possible for Fuchsia to “natively” run apps and libraries that were built for Linux or Android. To do this, Starnix would act to translate the low-level kernel instructions from what Linux expects to what Fuchsia’s Zircon kernel expects.
So ... custom kernel and a custom OS that will support Android applications as far as I understand ...