My interpretation is “Programming in their nature” -> their being, meaning the molecular structure that defines them, is a program, a complex program, one executed by the interpreter that is physics.
Not the person you are replying to. I guess they feel somewhat humiliated. There can sometimes be a fine line between scientific curiosity and the appearance of bullying. Common courtesy suggests we should back off whenever we feel that might be applicable.
As an ex-prefacer, imo it’s a hedge against the nudging recognition that the thought being hedged is based on a pyramid of iffy connections (usually more word-of-mouth type “science”), rather than an articulable, concrete a->b->c.
Cells are complex organisms and contain programming in their nature so we can more easily trace and understand its reasons
A frequency is something a lot more raw than a cell