Just doing basic data analysis of the charts shows little relevance between DDT and polio.
Polio went up before DDT in most cases, as well as going down before DDT use was reduced, not to mention that polio went down during an increase of DDT use in 1951.
Also, polio was dramatically reduced in the late '50's while DDT in the body fat was still climbing.
There's really only a few places where polio and DDT are similar, but that's definitely not enough to make this sort of claim.
This is even if those charts are accurate, which I highly doubt, since they are on a conspiracy theory site.
Overall, we rate the Weston A. Price Foundation a quackery level pseudoscience source based on the promotion of anti-vaccination propaganda and dangerous alternative nutrition.
Factual Reporting: LOW
Founded in 1999, the Weston A. Price Foundation is a nonprofit organization that promotes alternative health, nutrition, and pseudoscience.
That Weston A. Price Foundation article also says:
Through this intellectually paralyzing atmosphere, Dr. Biskind had the composure to argue what he thought was the most obvious explanation for the polio epidemic: Central nervous system diseases (CNS) such as polio are actually the physiological and symptomatic manifestations of the ongoing government- and industry-sponsored inundation of the world’s populace with central nervous system poisons.
The CDC plainly says polio is a virus, not a poison.
Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.
The virus spreads from person to person and can infect a person’s spinal cord, causing paralysis (can’t move parts of the body).
Polio is absolutely a virus, as can be seen through an electron microscope and has RNA, which poisons don't have.
Poliovirus is composed of an RNA genome and a protein capsid. The genome is a single-stranded positive-sense RNA (+ssRNA) genome that is about 7500 nucleotides long. The viral particle is about 30 nm in diameter with icosahedral symmetry. Because of its short genome and its simple composition—only RNA and a nonenveloped icosahedral protein coat that encapsulates it, poliovirus is widely regarded as the simplest significant virus.
This can be confirmed many places, including the Mayo Clinic site, which also mentions that the last naturally occurring case of polio in the US was in 1979.
Polio is a contagious viral illness that in its most severe form causes nerve injury leading to paralysis, difficulty breathing and sometimes death.
In the U.S., the last case of naturally occurring polio was in 1979. Today, despite a worldwide effort to wipe out polio, poliovirus continues to affect children and adults in parts of Asia and Africa.
This is well after DDT was banned in 1972.
The United States banned the use of DDT in 1972, but some countries still use the chemical.
Research on vaccine to reduce polio cases
As far as proof of the polio vaccine being shown to reduce the cases of polio, there's a significant repository of research and other information compiled here and here. And the WHO states that since the resolution to eradicate polio in 1988, in India alone the cases of polio have dropped by 99%, and this is still an ongoing fight to get rid of polio. India still uses DDT in limited instances to kill mosquitoes carrying dengue, but going from a 350k cases in 1988 to 160 in 2020 doesn't correlate at all with the use of DDT. If we look at the graph for polio cases in India, we see that the cases dropped dramatically in the 80's and 90's, which is well before DDT was even partially banned in 2008.