Upgrade on a bolt is non-existant but also irrelevant when comparing price per kWh to consumers.
Not true.
Replacement is subsidized by marketing priorities (aka avoid bad PR.)
Upgrade requires additional R&D, suspension hardware to support the extra weight.
Don't look at the kWh label, look at the $/range increase
$10k bought 57 miles in the chart you show
In a Model 3 $9k buys 90 miles.
But let's look at today:
Model 3: $9k USD for 90 miles extra
Model S:
75D: 259 miles range, $74,500 USD
100D: 335 miles range, $97,500 USD
76 miles extra for 23k USD
The $/mile upgrade of the Model S is 3x that of the Model 3.