IMHO it absolutely does not matter what the internal investigation determined and how the doorbell interaction went, it is unacceptable to disable the purchased

IMHO it absolutely does not matter what the internal investigation determined and how the doorbell interaction went, it is unacceptable to disable the purchased equipment no matter what - even if they were literally convicted of a felony. If a company wants to stop future sales to a certain customer, that's fine, but all past purchases should still work.