Cannot Use Kotlin 2.0 Features After Upgrade

I upgraded my Android project to Kotlin 2.0, but I still can't use Kotlin 2.0 features. I believe I have done the integration correctly, yet I keep encountering this issue:

libs.toml

[plugins]
kotlin-compose-compiler = { id = "org.jetbrains.kotlin.plugin.compose", version = "2.0.0"}

app.gradle

plugins {
  alias(libs.plugins.kotlin.compose.compiler) apply false
}

build.gradle

plugins {
    alias(libs.plugins.kotlin.compose.compiler)
}

gradle.properties

kapt.use.k2=true
ksp.useK2=true

I also removed composeOptions from the build.gradle file. However, IDE still warns me. Pls check this photo below.

I'm attaching the code here for you to copy

interface Status {
        fun signal() {}
    }
    
    interface Ok : Status
    interface Postponed : Status
    interface Declined : Status
    
    fun signalCheck(signalStatus: Any) {
        if (signalStatus is Postponed || signalStatus is Declined) {
            signalStatus.signal()
        }
    }

Source: View source