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by dx034 2437 days ago
It's not. I know of several instances where IP is at least used as a filter. Esp. the combination of user agent and IP require no JS and can help you to track users across domains easily for small to medium sized websites.
1 comments

Yes, if it is available it can be used.

The point of the assertion is that you can be tracked even if your IP address is obscured, mangled, or spindled.