To the OP, I feel your pain, as I learned this the hard way.
I was hired to shoot, direct, and edit a pilot of a restaurant/traveling show. They hired their own audio technician, which used a boom (above and below the talent), but used no dampening material.
The audio turned out to be hideous, sounding quite like your sample. The worst was during shots in the kitchen, nearly (and I would say) unusable.
I’ve always personally used lavs, and never have had any major issues.