They (the company that uses these things) correctly used the term "anomalies" meaning something unusual. This could be anything: a rock, a void, differences in ground density. Totally unknown. This part was OK.

They also included the idea that they 'could be' human remains. That was their ticket to $$$ piles of money. The huge majority of anomalies are very small, far smaller than even a child's grave.

In all the ensuing digging & searching they found ONE (1) human bone. It was dated as over 600 years old... so a nothingburger.

Oh, they did find some human graves. These were unmarked graves known and documented for a century. Most had the wooden markers burned away in a fire, or simply rotted away. Few graves weren't marked at the time.