I do buy some stock there (when I have three hours to kill) but, I would not rely on the advice.
Pressure out is only as good as pressure in!If the water is emptying faster than it can make up, you will lose pressure.
If, as you say, the pressure decreases the longer the hot water is on, I would start with the intake at the water heater and follow it back.
I would make sure all the valves on the line where all the way open.
Then I would do as the others have stated, check for "Crud". Again, I would be looking on the intake side because the out flow presssure is good at first and then goes away.
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