This is a good summary. Use the CRAP test!
An artist statement is most often the front line of communication between an artist and the public. It will be used when you submit your portfolio to competitions, galleries, and museums. It may sometimes be displayed when people are viewing your works in person or on your website. If it’s online, your artist statement will be read by people from all over the world.
If you can make your statement clear, concise and consistent, you are doing better than about 90% of the artist’s statements out there!