It's unclear why Aquasuite relies on this service, especially when other applications can run without it.
Moreover, there's a question as to why this software should require the DNS service to operate.
Additionally, your proposal to test it with a new Windows installation seems disproportionately extreme.
I think the answer to the why is clear, because it was programmed that way, you will hardly find out what the programmer was thinking, with any provider.
Troubleshooting with a fresh Windows, on the other hand, is a completely normal step that has been used for a long time, so you can rule out or confirm that the malfunctioning software is the source of the error and then, if necessary, find the actual source of the error by installing individual programs/drivers.
In a grown Windows, however, troubleshooting is extremely complicated and therefore much more extreme than a second HDD/SSD with a quickly installed Windows.
Translated with DeepL.com (free version)