TTUS "champion" here. While the company might have some red tape to cut through to identify respondents, that information isn't provided upfront even at senior levels.
What you likely already know but is specifically discussed in TTUS meetings:
They DO NOT want to hear anything more about RTO. They are tired of it. They want people to move on. Do with that information what you will.
They DO NOT want you to use your voice to express anything other than what they want to hear about. Discussions actively include brainstorming on ways to steer employees to only focus on certain topics.
They DO support making changes. Discussions include ways to improve on items that are ranked low, but only when it aligns with what senior management considers to be valuable. They DO NOT care about what we care about.