2010 CX-7 Venting coolant question

I have a 2010 CX-7 with 177,000 miles that I have had since new, it runs great. I would like to replace the coolant hoses just because they are 12 years old. There is a guy on YouTube who says you have to run the engine at 5000 rpm for 5 minutes to get the air out of the system when replacing the coolant. Can that be true? He says he's quoting a Mazda maintenance manual which I don't have.

Thanks in advance
 
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