I don’t get the point.
The “Expert” said it couldn’t have lifted the kid...that was his opinion.
Now you’re changing the argument (or whatever the point is) to talking about a piloted balloon (helium balloon in the common sense are rarely used nowadays, they are hybrids because helium is relatively expensive to continually vent to the air)
Nobody was in control of this homemade contraption except the slow leak it apparently developed
Why don’t they just refill the balloon and test it?????????????