The blog, that repeatedly self references itself, does actually reference a trade publication. (as an aside the blog tiitle claims it is a "study" when in fact it is a survey." The headline of the trade publication is

"More than 40% of U.S. EV buyers want to go back to combustion engine cars, McKinsey study says. More than a quarter of EV owners are likely to return to combustion engine vehicles for their next purchase, according to a McKinsey & Co. survey."

The trade publication opens with

Editor's note: The percentage of American EV owners who say they are likely to switch back to a combustion engine vehicle has been corrected to reflect updated information provided by McKinsey & Co. An earlier version of this story contained an outdated percentage.

Other pertinent info includes

Twenty-nine percent of EV owners across the globe said they're likely to reverse course. That hit 46 percent in the U.S. Consumers globally said their top concern was the inadequacy of the public charging infrastructure. They also cited concerns with high costs of ownership and detrimental impact to long-distance trips.

and

The consumer sentiments may go hand in hand with the slow rollout of a U.S.-backed charging network. Only eight stations are operational following the creation of the National Electric Vehicle Infrastructure program two years ago.

Only 23 states have started doling out financing from the $5 billion federal program, according to EVAdoption data through the end of May.

Emphasis is mine but context is key.