Shrimper's Trick For Easy-Peeling Boiled Shrimp?

I was looking at this recipe from Louisiana Cooking Magazine:

Boiled Shrimp

4 cups ground crab boil
1 cup liquid boil
1/2 cup Louisiana-style hot sauce
1 lb salt
1 onion, cut in 1/2
2 garlic heads, cut in half
2 lemons, cut in sixths
10 new potatoes
6 ears sweet corn, cut in 1/2
4 gal. water
10 lbs fresh Louisiana shrimp, heads on

Bring water to a boil and add all seasonings, the onion, garlic, and lemons, except the salt.


Chef's Note: This step is very important as it will aid in the peeling of the shrimp. It's an old shrimper's trick.

Flush shrimp with tap water until water runs clear and the eyes of the shrimp grow in size, about 5 minutes.

When water comes to a boil, add the potatoes, cook 10 minutes, and then add the ears of corn and the shrimp.

Bring the water back to a boil and cook for an additional 2 minutes.

Turn off the shrimp boil, remove the onion from the water, and cut in sixths and return to the water.

Add 3/4 lb. of the salt and rest for 10 minutes.

Taste 1 of the shrimp to determine whether the additional 1/4 lb. of salt is needed. Let the shrimp rest in the boil for an additional 20 minutes.

Servings: 6
Source: Louisiana Cookin

So, what is your opinion of the chef's tip (in bold)?