You and uncle Al are talking about two very different things. You seem to be assuming that not having 'free will' means that past events and conditions absolutely determine one's actions. Uncle Al is assuming that (time being a dimension) all past, present, and future 'currently' exist along the time axis (a block universe)... that what action you decide to take at this point on the time axis, you have already done further along the time axis.
ETA:
You may want to google "block universe" for a better understanding of what Albert was talking about.
We are certainly talking about two different things. Einstein is defining free will as "freedom from causal necessity", an irrational notion because every freedom we have, to do anything at all, requires reliable cause and effect. I am using the normal, operational definition of free will, which is choosing for ourselves what we will do while "free from coercion and undue influence". This is the definition that humans actually use when assessing a person's moral or legal responsibility for their actions.
Universal causal necessity/inevitability is a logical fact, but it is neither a meaningful nor a relevant fact. It is a like a constant that always appears on both sides of every equation and can be subtracted from both sides without affecting the result.
The only meaningful information is our knowledge of the specific causes of specific effects. The toddler learns that by moving his body and legs in a certain way allows him to walk. From this he acquires the freedom to run all over the house. The medical researcher knows that covid-19 is caused by a virus, and that vaccination can prime the immune system to destroy that virus, giving us control over the disease. Reliable cause and effect is essential to both our freedom and our control.
The view that reliable causation strips us of freedom and control is a bit perverse. It makes a boogeyman out of causal necessity. It sends the scared theist running to the supernatural and the atheist running to quantum indeterminism. But the boogeyman is just an illusion.