Agreed, it doesn't credit or discredit them, but it DOES mean he hasn't proven his case. He's making empirical claims about human nature and the way the world works, insisting they're mathematically and scientifically correct, while arbitrarily redefining those terms to mean "undeniably," which is not what they mean. Until the testing is done, you cannot legitimately argue his claims are proven, all he's offered is anecdote and speculation, and the default position is "presumed false until tested."
Here's how it works.
1. Any true claim must in principle be falsifiable, as I explained above.
2. The arguments offered in support of it must be logical, coherent, and consistent
3. The evidence must be comprehensive, you must consider ALL evidence, not just what supports the claim.
4. The evidence must be evaluated honestly, without bias, self-deception, or deceiving others.
5. Any test must be duplicated by others, a single result is never adequate to prove a claim.
6. The evidence must be sufficient to establish the truth of the claim.
7. The burden of proof is on the claimant, it's not up to others to prove him wrong.
Lessans' work does not meet enough of those conditions for his claims to be accepted as true.