This cable channel didn't know the extent of how this star was a fraud, but they knew her lifestyle was above and beyond her documented income. They just didn't want to know. That is different than saying nothing showed up in a background report.
There are all kinds of apples. But this one in this story is a green, sour apple. It’s in a bowl of fruit with a bunch of peaches and a tasty orange. The apple thinks it is the best fruit in the bowl. "There is no one like me," it thinks. The peaches are just happy being peaches. The orange just does its thing. It likes the fruit bowl just fine, but sometimes she likes to roll out of the bowl and do other things.
Much like what happened a decade ago when this show/cable channel bought some pictures of an east coast Housewife naked in a st.rip club, the same thing happened this past year when pictures were offered for sale of a west coast Housewife naked in a st.rip club. If they hadn't, it might have made her character more interesting.