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 on any given subject.  Mostly, they repeat something they heard, or read from another, equally unsourced website.  When relying on the "wisdom fo the crowd", its best to remember that *definitionally* half the population is more stupid than average - and the web seems to select for them.
Look to the studies first.  They are repeatable, have measurable results.  We can talk facts and figures instead of "i heard" and "i read".  After all, Garden Betty has a well followed website with a bunch of claims on it - yet doing the math (even her math, with unsourced claims for the nutrition of various ingredients) shows those claims to be in error.  Yet plenty of the crowd goes to her for advice.
I am **NOT** an expert.  You should *absolutely* feel free to ignore everything I have to offer.  I am, after all, just some anonymous guy on the internet.  But I encourage you to at least look at the studies I linked as the basis for my opinion, above.  I find them more authorative than some websites(s)