The headline is wrong. "Dreams Before the Start of Time" by Anne Charnock is the 2018 winner of the Arthur C. Clarke award: https://www.clarkeaward.com/2018-winner/

They must be referring to the Sir Arthur Clarke Award [1] (for space exploration), not the Arthur C. Clarke Award [2] (for Best Science fiction novel).

[1] https://en.wikipedia.org/wiki/Sir_Arthur_Clarke_Award

[2] https://en.wikipedia.org/wiki/Arthur_C._Clarke_Award