I say it's not too spicy.
Go easy on the Sriracha Hot Chili Sauce if you are afraid of the heat. The mayo really mellows it out nicely. Taste the sauce before you toss it into the shrimp.
I made 5 pounds of Bang Bang Shrimp on Friday night for a church thing - it was the most popular item out of about a dozen things & no one complained about it being too spicy. The sausage & cream cheese stuffed Jalapenos, on the other hand... Them babies were especially hot & I don't know why.
I use 2 pounds of shrimp for the amount of sauce listed in the recipe above.