You are missing the entire point:
The very nature of these wells, with long laterals, fracced into extremely tite formations, causes very prolonged periods of time to occur to get much production decline.
Most conventional strippers are not the same. They are in more permeable formations and are vertical. Very different mechanisms of production.
As an example: I observed a Bakken well that produced +10 years and afterwards producing at low rates that had a well that encountered virgin pressure only 100’ away from the wellbore.
We are talking about massive pressure differentials within a horizon that causes oil to ‘bleed’ into a fracture system almost constantly, with a well suffering little observable decline.
A marginal unconventional horizontal, stage-fracced well is a completely different animal than most of the wells currently classified as stripper.
While the mechanisms of production are different, the result, decades of low flow production is not.