Ummm, no. There are definite benefits to cooking lentils (albeit with some tradeoffs), but its not absolutely required. Much greater concern with feeding too much of lentils.
Honestly, I give very little credence to what a bunch of anonymous people on a bunch of anonymous websites have to say...
You also have no population to compare against.
Here's the deal. "The Dosage is the Poison". How much, for how long is a key factor.
Lentils contain a host of anti-nutritional factors (albeit at lower levels than many other common feed ingredients). Many of those factors can be reduced either...