There is, as far as I recall, evidence of an "exodus" of sorts of the Hyksos from Egypt, but not any (solid) evidence of it happening in the manner or time described in the Biblical account.
I'm not sure I buy the Israel = Hyksos theory anyway. But this gets fairly far from my question, which really related to what the authors of this particular paper allude to, but don't say explicitly. They use some fairly strident language to describe what it is they are not talking about. I was just curious what that was, and why.
Have a look at what happened more than a decade ago when a paper came out showing no genetic distinction between Palestinians and Jews. Any discussion of nationalities in the Middle East is a political minefield.
Also, ever since The History Channel became the Aliens and Nazis Channel, the authors are probably afraid of being very badly misquoted in some Exodus documentary. The strident language makes it nearly impossible to cherry-pick a quote for a documentary without it sounding like complete gibberish.