The site wasn't (isn't) about the data. It's about articles that contextualize the data. The money raised has allowed them to stand up a new site with all the old articles (which truth be told were all still nominally accessible via the internet archive) and will help fund them to create new ones. So it will stay relevant by paying the people who in the past worked for NOAA to creation the content, to now create the content paid for by donation.