"increased migration of macrophages into the brain and increased levels of beta-amyloid"
In fact, the exact opposite is true.

FYI

June 27, 2016
Cannabinoids remove plaque-forming Alzheimer’s proteins from brain cells

Preliminary lab studies at the Salk Institute find THC reduces beta amyloid proteins in human neurons.

www.salk.edu/.../


Also;

" The cannabinoids are found to have particular application as neuroprotectants, for example in limiting neurological damage following ischemic insults, such as stroke and trauma, or in the treatment of neurodegenerative diseases, such as Alzheimer's disease."

https://patents.google.com/patent/US6630507B1/en


I am afraid your article has fallen victim to the decades of Institutionalised Negative Bias Against all Forms of Cannabis use that has pervaded society since the erroneous designation of Cannabis as a schedule 1 drug in the early 1970s.

Essentially schedule 1 Designation has virtually barred almost ALL possibility of research into the medicinal benefits of cannabinoid Therapy since the early 1970s and yet given this seeming insurmountable road block to ‘positive research’, and an obvious bias towards the ‘negative research’, there is far more evidence of the benefits of cannabis use, as opposed to clinical evidence supporting the over exaggerated, and scientifically unfounded, claims of deleterious effects on human physiology.

How were the medicinal benefits of Cannabinoid Therapy ever to be discovered when the medical community has essentially been barred from researching it for over half a century?