Greta has raised awareness that Greta is still around, that Greta was on a boat, and that Greta got a plane home.
Doubt that many every day people have dug in to the story enough to find out things like the boat was carrying ~5 tons of random aid, or that there were 11 other people on it, or that the organisation whose name it was in has existed for several years not a few weeks.
So fair enough, she got me to look into things a bit more, which is a win I suppose, but I doubt that many will have bothered, I did find it quite difficult for instance to find out that the cargo was 5 tons and what the cargo was, I had to ask Grok some quite precise and determined questions to find that out.