Probably going for a more international audience. A lot of other countries view Americans as self-absorbed and oblivious to other cultural perspectives.
Leading with Bigfoot; a relatively late, and distinctly American, entry into the hairy hominid pantheon; as a means to address a worldwide issue isn't the best way to introduce a potential breakthrough that could result in international acclaim, and put him in the running for a Nobel prize.
Skeptics are going to jump on the Nobel comment, but if they look at it OBJECTIVELY, they have to admit that someone who manages to prove, using accepted scientific protocols, the existence of a species of reclusive hominids is going to be recognized.
Sykes isn't the first American to approach bigfoot from an expatriot perspective. Sanderson also did so, leading with "Abominable Snowmen" (ABSMs) as a broad definition for such hominids worldwide.