Not necessarily. The AvP movies make little to no mention of the Alien and Predator respective franchises. And in those films only a single reference is to be found in the two, which was in Predator 2 with the alien skull. A single cameo reference doesn't mean they are necessarily connected, otherwise Mass Effect would share a universe with Halo.
Actually, the AvP movies are connected to the Alien and Predator films, especially with the expanded universe material and script drafts. I do know that Arnold was scheduled to appear in Alien vs Predator, but only if he lost the govenor's election back in 2004. Dutch Schaefer was even written for the ending of Alien vs Predator.
Also, Rebellion's Alien vs Predator 3 Audio Files even makes mention of the events of the Alien films such as the events of the Nostromo, Hadley's Hope, and Fury 161. Also, Audio Files from Karl Bishop Weyland do make mention of the Antarctica Expedition of 2004 by Charles Bishop Weyland.