I am not sure what kind of wolf dog hybrid the neighbor has but as someone who has researched them extensively and had a 50/50 Wolf Shepard hybrid for 13 years (RIP Dakota), this man has my hink meter up.
Not knowing the breed his wolf dog is crossed with or the purity of the wolf contribution makes it difficult to say this with certainty, but in general wolf dog mixes are not big barkers.
They are not known to be good watch or alert dogs as they are timid with people and do not bark their heads off when people go by. They will occasionally bark or "yip" as a warning but tend to howl, huff, and growl as their main vocalizations and much of their alert signals are silent (body language). Their vocalizations tend to be singular. A bark-growl, followed by very low growling to warn an intruder violating his territory, for instance.
Knowing as much as I do about wolf dogs, I tend to doubt this man's story in the following ways.
a) he is full of it and wanted face time.
b) he does not own wolf dogs but calls them that because he thinks its cool
c) something in his affect is just off
MOO
High content hybrids are not good watchdogs, due to the wolf's timid nature. Do not expect a high content hybrid to protect you or your property. High contents and pure wolves don't bark much (usually one warning bark, as opposed to the dog's repetitive bark), so they don't make good "alarms", either.
Howling - wolves and hybrids howl, whether out of loneliness, at sirens, or for their own wolf reasons. Take into consideration what type of neighborhood you live in and what your neighbors will put up with. Not everyone appreciates the eerily beautiful howl of the wolf, especially at 4:00 am.
http://www.inetdesign.com/wolfdunn/whate/whate1.html
The sound most people associate with a wolf or a wolfdog is the "wolf howl." No two wolfdogs howl exactly the same and their vocalizations are primarily a means of communication that can be separated into four categories: barking, whimpering, growling, and howling. Sounds created by the wolf dog may actually be a combination of sounds such as a bark-howl or growl-bark. Barking and growling are used as warnings. Whimpering may be used by a mother to indicate her willingness to nurse her young. It is also used to indicate "I give up" if they are in a submissive position and being dominated by another wolf dog. Howling is the one form of communication used by wolves and wolfdogs that is intended for long distance. A defensive howl is used to keep the pack together and strangers away. A social howl is used to locate one another, rally together and possibly just for fun.
http://www.wolfacrekennels.faithweb.com/rich_text_1.html
again, MOO, something is off with this newest neighbor with wolf dogs who didn't bark.