Reports

Q: "Does anyone know what is wrong with this code?"

A: First, the is a syntax error

template error while templating string: expected token 'end of print statement', got 'item'. String: {{ kill item }}. expected token 'end of print statement', got 'item'"

the cmd should be

shell: "kill {{ item }}"

Despite of the question looks like a duplicate of How to kill running process using Ansible or How force kill process and exit from ansible-playbook if not successful?, you may try the specific Ansible module in this case, here pids module – Retrieves process IDs list if the process is running otherwise return empty list.

---
- hosts: localhost
  become: true
  gather_facts: false

  tasks:

    - name: Getting process IDs of the process
      community.general.pids:
        name: httpd
      register: pids_of_httpd

    - name: Force kill the processes
      shell:
        cmd: "kill -9 {{ item }}"
      loop: "{{ pids_of_httpd }}"

Furthermore you should try to just simply stop the processes via service module – Manage services.

---
- hosts: localhost
  become: true
  gather_facts: false

  tasks:

    - name: Stop service httpd, if started
      service:
        name: httpd
        state: stopped

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