I believe the claims are valid. There have certainly been many people reporting their happiness in the past, but obviously also a few less satisfied.
They also have LLU 75 packages that compete with these unlimited ones on many exchanges. These are expected to give more consistent performance in terms of speed and stable latency, at the cost of the higher price and 75GB cap. If you think about the claim you quote and the one for LLU 75 I think it is reasonably clear.
We need to know your exchange to see which network you can get. It could be neither, one or both.
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