That's all good and fine, but it doesn't really change the hyperbole.
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It means that if you connect to a tower that is congested you will get deprioritized only on that tower and only when it's congested. As to what speeds you'd actually get, that would depend on the congestion and your deprioritization, but it can certainly be that you'd just get something like 5 instead of 50, as you mentioned, rather than 2G speeds, but it could also potentially mean you could get slower speeds potentially along 2G speeds as well.