I understand doubt - it's a good thing. One should not have blind faith but be inquisitive, analytical, look for reason and real understanding. So, I'm cool with your question. Bring it on.
I did the BH cleanse and others. As a scientist, I took it, analyzed it. It is just scientifically impossible for the black ropes to be formed by the P &B in such short periods of time. If you take the ropes, cut them in half, you can see the difference. Plus the outer, black coating is full of dead cells, and such a wide variety of substances not in the shakes. Further, I didn't do this but others have done chemical age tests, showing that the age of substance can test years old.
When I did the cleanse, I had BMs that were just the shake mixture, unformed and grayish - very different from the ropes. I've also done colonics where pieces of mucoid plaque came out identical to the BH cleanse long after any use of P &B.
Do you have some real data or info to suggest that the ropes aren't mucoid plaque?
If you doubt - that's great, but then, seek further, follow through your questions.
Find real answers. This is good, we should all do that.
Continue on your journey and always seek to learn as much as possible.