I asked this question on the Ansible forums as well and received a response.

Quick link: Error: 'ProxmoxNodeInfoAnsible' object has no attribute 'module' · Issue #114 · ansible-collections/community.proxmox · GitHub - i.e. check your proxmoxer version.

TLDR: ProxMox v.8.4 only comes with proxmoxer 1.2.0. Needs to be >=2.2. Best option suggested is to create a venv for python3 and run a special ansible user on the proxmox host.