I am using the more generalized definition. Wikipedia says:
In 2003, Lovallo and Kahneman proposed an expanded definition as the tendency to underestimate the time, costs, and risks of future actions and at the same time overestimate the benefits of the same actions. According to this definition, the planning fallacy results in not only time overruns, but also cost overruns and benefit shortfalls
A fantastic illustration of the planning fallacy
That isn’t the planning fallacy.
Intel kept throwing money at the project for years, indicating that they must have been planning on the basis of these predictions.
Which is not the same thing as expecting a project to take much less time than it actually will.
Edit: I reveal my ignorance. Mea culpa.
I am using the more generalized definition. Wikipedia says: