Earlier quoted context omitted.
They've never made an official statement or confirmation of what Fuchsia is intended to be used for, if anything. An Android OS dev making this statement is, in fact, significant news.
AlexandraSalvaterra's github page shows that she is not a member of the Github Google organization. So I don't believe she is an Android OS Dev working for Google, or that this should be considered an official statement. The articles that she linked to were old ones which have a note saying that Google denied that the speculations were true. And herself said in a later tweet that she was "putting things together" and…
Anyone who works at a BigCo knows there's no way in hell anyone's made a decision about something 5 years out. There's a lot of risky dev between here and there
I think they meant to suggest Fuchsia could replace the Linux kernel in that timeframe