> One last point about the linked list structure at the heart of Lisp. Linked lists are poorly executed in modern computers that rely heavily on locality of data, to optimize the L1 cache.

You could maybe say that linked lists are at the heart of the platonic ideal of Lisp. Naive interpreters might use linked lists in their internal representation. But real implementations of e.g. Common Lisp or Scheme provide a wide array of data structures (multi-dimensional arrays, hash tables, linked lists).