Trainer options for Big, (and fat), guys

That is an interesting piece of writing, BUT
The individual aircraft flight manual is the authority on weight and balance.

I think what you are trying to rationalize is a situation where a pilot weighs more than 242 pounds but when you do the math the aircraft loading is still below the maximum non-lifting load limit, below the maximum all up loading, and the aircraft is within C.G. limits. This is always an interesting discussion.
However, the aircraft flight manual is the authority for each individual aircraft. Perhaps things like the design of the seats and backrests are some limiting factors in the maximum pilot weight of 242 pounds.
You should ask the manufacturer what their opinion is.
You should ask the FAA via the local FSDO office what their opinion is.
Let us know what you find out.