As far as I am aware, you were correct in changing the “name” tag from Armenian to Azerbaijani after the change of ownership of the region, but you should not have deleted the “name:hy” tags. But, I don’t want to claim that I am an authority here, so I will refer this to DWG, they will be better able to formulate policy and make a decision.
By the way, first, I believed it only affected the 4 towns in Changeset: 142772453 | OpenStreetMap so I fixed those by manually editing them again because I believed it was just a small thing. But later on I found the three additional changesets listed above with 200 additional deletions, which is why I wanted to collect further feedback.