If we are deplted in glucose the body would use muscle proteins but nit for long because the proteins are also needed for other processes so it shifts to fat storage.
But in a keto diet which is rich in fat the glycolysis and gluconeogensis would be reduced because fat is abundant and it has to be utilized.
What the post is simply saying is that ketodiet lets your system run solely on ketosis doesnt mean that glycolysis and gluconeogenesis would not occur