Force methods to respect readonly signature in interface

Question

This resembles this post, but not a duplicate IMHO

class Person {
  constructor(public age: number, public name: string){} 
}

interface AbstractVisitor {
  visit(_: Readonly<Person>): void;
}

class ConcreteVisitor implements AbstractVisitor {
  visit(p: Person) { p.name = "moish"; }
}

How come ConcreteVisitor does not respect¹ the Readonly property in the interface ?

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¹ no errors with npx tsc --target es2020 --strict main.ts