When there are many offers, it is called a multiple offer situation. Brokers and agents are ethically required to disclose this as a fact when this is the situation.
If no offers had been made the broker could not have made the statement. If a broker lies to a consumer about the existence or non-existence of offer (offers), that broker could face serious discipline for lying.
Is it possible that you have encountered a dishonest person that decided to lie to you for no good reason? What? to encourage you to overbid the list price? That is of very little benefit to him.
As many people react to the report of multiple offers by declining to compete as those who choose to join in the bidding.Lying to you would have been a self-defeating strategy for slitley.
If you think most people are lying to you most of the time, then feel free to go through life that way. Though I warn you, carrying that level of universal distrust is as naive as believing that everyone tells the truth all the time. (Watch the movie "The Invention of Lying" starring Rick Gervais.) http://www.youtube.com/watch?v=yfUZND486Ik
Realistically, if the reward for telling the truth has a better expected outcome, then even a basically dishonest person will tell the truth in that particular instance, simply because it is in his own best interests.
The exception to the above theory is pathological liars. My theory is that normal humans do often lie when the apparent benefit to them of telling a lie is greater than the apparent immediate penalty. Pathological liars will lie to you, rather than tell the truth even when it imparts no outward benefit.
So if you have know this guy for quite some time, and he is always lying about everything, then the answer to your question is "yeah, maybe"
If you don't know him that well, you should understand that the percentage of pathological liars in our midst is still fairly low, though it seems larger than it is because of the damage they do, and the fact that even normal humans lie sometimes.