What are the odds someone who can prove whatever those things are can also talk about harmonic resonance equations and the practical matters of designing instru

What are the odds someone who can prove whatever those things are can also talk about harmonic resonance equations and the practical matters of designing instrument-compatible chording arrangements, two topics entrenched heavily in mathematics (and physics, and materials science, and human usability concerns) but with a completely different specific focus? The odds are near zero. Everyone learns their own domain. Quoting random properties of a specific subdomain of a branch of all possible learning demonstrates your knowledge, not disproves theirs.