What’s the difference between “minifyEnabled” and “useProguard” in the Android Plugin for Gradle?

Quoting from tools.android.com:

Built-in shrinker

Version 2.0 of Android Plugin for Gradle ships with an experimental
built-in code shrinker, which can be used instead of ProGuard. The
built-in shrinker supports fast incremental runs and is meant to speed
up iteration cycles. It can be enabled using the following code
snippet:

android {
    buildTypes {
        debug {
            minifyEnabled true
            useProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt')
        }
    }
}

The built-in shrinker can only remove dead code, it does not obfuscate or optimize. It can be configured using the same files as
ProGuard, but will ignore all flags related to obfuscation or
optimization.

Unlike ProGuard, we support using the built-in shrinker together with
Instant Run: depending on the project, it may significantly decrease
the initial build and install time. Any methods that become reachable
after a code change will appear as newly added to the program and
prevent an Instant Run hotswap.