[Sherman Logan]

“Consequently, for nearly 100 years LENR processes have effectively been hidden in plain sight from the vast majority of the scientific community.”

Or. They aren't really there. Your "extraordinarily sensitive" instruments are providing you with false data.

[Kevmo]

From the sentence just before your quote:

But if low energy nuclear reactions are so commonplace, why haven’t scientists noticed them before? In part because they haven’t looked. LENR activity is subtle, according to Larsen, and it “can only be readily detected and measured through the use of extraordinarily sensitive mass spectroscopy techniques on stable isotopes.”

[Wonder Warthog]

"Your "extraordinarily sensitive" instruments are providing you with false data."

Unlikely in the extreme. This is mass spec providing the analytical results. Nothing esoteric about it at all. MS is well understood, as are the factors that affect it.