That means bookies are just underestimating Campa making him a huge underdog. I think Campa will give Lopez a real challenge, so an upset is also possible here. Lopez sometimes losses his focus, what if that will happen again in this fight? Are we going to see another L of Lopez here?
We will only know they are underestimating if Campa will win, but for now, it's very obvious that most fans believe that Lopez will beat Campa. Bookies does not make their own odds based on nothing, it's always based on what majority of bettors or fans think about the outcome of a certain fight.
Odds are just showing the probability in a fight, Lopez is a heavy favorite, then that means he will likely win but it's not guaranteed. Also, on seeing the odds, that depends on the bettors, some think a fighter is underrated but for the other bettor it's not, so it's based on our personal judgment only.
Not an assurance at all, maybe he got the edge but boxing is a kind of sport which have many surprises, a lucky combination can take down a heavy favorite fighter, just like how things ended with Alvarez against Bivol lots of fans support Alvarez but it was Bivol who works well and protect his belt.
Though it's still different from how both Lopez and Campa will fight and we never know how they will throw their punches once they are already inside the ring, just looking to see good counter over another counter punches.