Is the harm then a) that these people are exposed to the larger ideology, or b) that these people don't have the critical thinking tools or habits to see these ideologies for what they are?
I think it's (b).
In life we are exposed to a lot of bad ideologies, and the only thing that can help us navigate these ideas is our own thick skin and critical thinking tools and habits. The only way you develop these are through exposure and practice.
The memo attempts to use references to what the author sees as well accepted science. If you have a disagreement with the science, you can disagree. However, the method the author to used construct the memo, i.e. referencing studies, is the correct method. At worst you could attempt to call it bad science mixed with ignorance.