This will resolve YES if the Manifold admins decide to cut the interest rate on the platform to be under 5% before Dec.31 2026 11:59PM

The change will only count if it is actually implemented. Announcement then cancelled wouldnt resolve YES.
An increase in the rates would not be a cut, so it wouldnt resolve YES.

The feature being removed would count as lowering the interest rate to 0%, so this market would resolve YES