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Don't most people use "rolling friction" to describe the difficulty caused
by a compressible tire -- the fact that the horizontal tangent to the tire
is not along the roadway -- such that the tire is always "climbing out of a
hole" ???
So going downhill, kinetic friction is uphill and static friction is
downhill.
In the quoted post "kinetic friction" has been defined as the rotational
friction on the axal by the bearing surface. How could it's direction be
"uphill"?
If the toy car is accelerating downhill under gravity and with rigid
rotating tires, there is no "static friction" -- unless of course the toy
car has a miniature supercharged engine in it.