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Yes, they made changes to the actual plans themselves beyond just the renaming of SSB to General Base.
At least part is the following pulled from the link above:
We’ve made two specific updates to these base plans.
First, we’ve renamed “Sweet Spot Base” to "General Base . "Sweet Spot base wasn’t descriptive of what was encompassed in the plan, and led to confusion.Second, we’ve changed the work-to-recovery ratio from 5:1 to 3:1. This means you’ll get a recovery week every fourth week in your general base plan.
Sunday Endurance
Sunday rides in both Masters Plans and our normal plans have switched from sweet spot rides to endurance rides.This gives athletes less intensity and the opportunity to extend the duration of their Sunday aerobic ride if they’d like.