Consequences of that kind of guide is asking during MP game "how to identify contact if i haven't shown all blades" (its from real game). In my opinion suggesting that counting blades is important for inentification is only misleading.
DW players should know that DEMON can show you blades only after giving tracker in BB - it's always happens later than checking first and second freq on NB. So this "guide" learn "how to be cannon fodder" for more experienced players.
Other parts of this "guide" also aren't merit:
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So let's take a minute to look at what these sounds represent. Ships make noise. There are machines constantly running inside the hull- motors, generators, the main engine, laundry machines, you name it. Those sounds radiate from the hull into the ocean. Different ship classes produce different frequencies of noise. Most ships also use one or more propellers (from now on, we'll call them Screws) to move the ship along its way. The screws generate their own noise as they rotate. As long as we know how many blades are on a screw we can calculate how many RPMs that screw is turning and from that we can make a very good guess at how fast the ship is travelling. Its worth noting that the lower the frequency of the sound, the better it travels through water. This is why you'll always detect the 50 or 60 hertz tone in narrow band first. BTW, 50 and 60 hertz aren't magic. They are based on standards for generating electrical power. Some countries like the US use 60 hertz as a standard while most of Europe uses a 50 hertz standard.
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Example up here - lots of words and little usefulness of information.
All of this only blurs what is really important - it does not help and even harms.