almost certainly untrue for most people.
most users cannot get high on a 20:1 CBD:THC
(my 20yr old can, but it takes less than 1mg of THC to get him high).
CBD and THC interact with the same receptors, the excess CBD essentially blocks access of the THC.
Cannabidiol binding and negative allosteric modulation at the cannabinoid type 1 receptor in the presence of delta-9-tetrahydrocannabinol: An In Silico study
We propose a putative allosteric binding site that is located in the N-terminal region of receptor, partially overlapping the orthosteric binding site. Molecular dynamics simulations reveled a coordinated movement involving the outward rotation of helixes 1 and 2 and subsequent expansion of the orthosteric binding site upon cannabidiol binding. Finally, changes in the cytoplasmic region and high helix 8 mobility were related to impaired receptor internalization. Together, these results offer a possible explanation to how cannabidiol can directly modulate effects of delta-9-tetrahydrocannabinol on the cannabinoid receptor type 1
this has been explored here: Why cbd nulls thc effects (eufory/high)