This exact percentages are irrelevant. Once you know that there are any people who do not want you to collect their data the only ethical thing to do is to obtain informed consent before collecting that data.
The percentages clearly do matter because otherwise people wouldn't be trying to pad their arguments by claiming large numbers support their position.
It's also important to remember that "data" covers a range of sensitivities, and vague assertions don't help the conversation. For example, the proposed system records less identifying information than visiting Golang.org but relatively few people would say it's unethical for that site not to have a mandatory opt-in requirement before loading a page - most of the interest tends to be in things like disclosure and retention policies.
