The person who posted Haiphong's video did not post it as an example of communist thinking worthy of understanding in order to oppose it. They posted Haiphong and Escobar's video as an example of truthful information and a viewpoint that should be adopted.
There is a giant difference between posting the opposite side's material so it can be analyzed and posting that same material and encouraging the adoption of its ideas.
A fascinating and odd assertion. By this, to you assert that the poster, Cathi, is "encouraging the adoption" of certain ideas? If so, I should like you to prove your assertion. If not, then an apology might be in order.