Wikipedian of the year" is selected. This year there were two. Rosie Stephenson-Goodknight is one of them.
From the Wikipedia article it is not so clear why Rosie was selected for this honour. At best it is a stub and it needs a lot of work before it becomes clear why Rosie is notable. The article is a one liner with a lot of "external links".
Rosie was the one person missing as an award winner so it was easy enough to remedy this. It is now just for anyone to do a better job for Rosie both on Wikipedia and Wikidata.