@Dayofpeace The paper you've cited does contain a great deal of interesting hypothesis, but light on specific evidence that any of the issues suggested may, or have been, of issue.
There is a great deal of real data out there which does counter suggested issues, already taking into account the following:
Development of vaccines and supporting models
Study of the natural disease and any evidence of ADE within patients and/or patients who have been treated with antibodies naturally produced in covid-survivors
Titre of vaccine material
Site of administration
Half-life of material and systemic distribution (regarding spike protein)
Physiological and immunological contraindications
No-one is suggesting that study and caution should not be exercised, but the area is extremely well placed for scrutiny.
Any caution should be balanced, as should any argument for or against.
We are all likely to be exposed to Sars-2 as time goes on. If it doesn’t kill us, we will have elicited an immune response to viral proteins expressed through infection. I would prefer my body to have a head start.
The necessity and/or ethics of immunising the young is another issue.
It is arrogance to perpetuate the contents of that paper as anything other than hypothesis, and some conjecture. That’s not science and medicine on the ground, IMO.