When did anyone say "2 weeks to stop the spread"

I remember "2 Weeks to slow the curve" and Trump's "15 days to slow the spread" but I don't remember anyone ever saying eradication was simply 2 weeks of lockdown away.

Even if it was as simple as 2 weeks away, many people chose to ignore the stay-at-home orders, so it's not really achievable. I think you're confusing 'moving goal posts' with constant failure to reach a goal followed by readjustment to new data.