This is propaganda. They bring up an non objective viewpoint of the truth, in order to define it as the truth. They do this by selecting the data, and information that supports their message.
Search on: Penis Enlargement and you will find a lot of this. Maybe not propaganda. Maybe the truth about the benefits with manual penis enlargement (doing exercises) haven't reached the public space.
So these webpages and sources of information, do not have all the information, in order to put out objective information about it.
They don't have all the facts. And it will be harder for men to discover penis enlargement. Because you have to search a bit and dig deep to find it (on the internet).