“not true.”
Actually, a good number of Keto supporters also say that’s the case, which is that protein turns into blood glucose (obviously at a much lower rate than carbs...but not at zero, like fats)....and so they say that high protein does work against achieving ketosis.
Gluconeogenesis is apparently demand driven. In other words, glucose is created as needed, not because there is excess substrate (protein) available.
Gluconeogenesis will only occur if your body needs glucose.