Type lambdas example not clear

I am a bit confused what this `Map` example shows here:
https://github.com/scala/scala3-example-project/blob/main/src/main/scala/TypeLambdas.scala#L6-L12

Since it works in Scala 2 also:
https://scalafiddle.io/sf/jjhjzwa/0

Sorry if I missed something.