That's really a dumb complaint. Sure, nobody is happy with the situation, but what do you propose a better reaction should be? Ignore the guy? Immediately drop whatever they think is a good idea (even though it may be not — it's still a matter of perspective, and somebody surely thinks it was a good idea) because somebody was pissed off by it, hoping that maybe at least he may change his mind and continue business as usual after that?

Or maybe an offer to set up a call and talk about the problem and possible solutions in person is not such a bad move after all? Seriously, I don't see how you can be mad at the fact that a representative of an organization wants to discuss the actual problem with an actual member of the community for a change, instead of just writing the usual "sorry but not sorry" corporate bullshit message and call it a day. Maybe it won't solve anything and they won't find a common ground anyway, but still, I cannot imagine a more honest attempt at trying.

One of the primary complaints was that an unmonitored bot has the power to override years of work done by volunteer translation teams.

First you have to stop the destruction. Then you can talk about how to make the bot work for humans, instead of against them.

They had specific complaints. Either say, "we're willing to work to change the things that you're complaining about", or say, "sorry, we're not going to change those things". The wishy washy bullshit they did is effectively ignoring the guy. They're ignoring everything the person said. And it definitely comes across as "sorry not sorry" corporate bullshit.

Revert the changes and then hop on a call to figure out how to do it right next time.

"Explain what's wrong and how to fix it" is the wrong approach. if you need it explained to you what was broken, then you're not the expert here, just the local tinpot dictator.