Does the AppSumo contract include a feature parity clause or a plan parity clause?

If there is a feature parity clause, is this how you interpret it?

Example:
If you add a new feature to your “Pro” plan in six months, you are required to give that feature to all AppSumo customers who purchased a lifetime “Pro” license—even if your pricing or included features change later.

What is your understanding of this clause?
How do you interpret which “Pro” plan features must be included under the parity clause?

My view:
I believe the current parity clause mean AppSumo buyers only get the features available at the time of purchase, and not any new features added later. AppSumo has allowed many companies to follow this approach in practice, even though it leaves users with an outdated product, which feels like user abandonment.