Erhm, the solution is in the quoted text..
Here is a copy/paste:
On node 2 and 3 perform:
$: touch /tmp/hi
tasks:
- stat:
path: /tmp/hi
register: me
- set_fact:
run_on: "{{ item }}"
with_items: "{{ play_hosts }}"
when: run_on is undefined and hostvars[item].me.stat.exists
run_once: true
- shell: echo
when: inventory_hostname == run_on
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