Can one-way window film actually be a detriment to my windows?
I don't like this question, simply because there are too many variables.  "CAN it be detrimental?"  Well...

Windows come in single, double and triple pane; made from glass or plastic; have different insulation systems between panes, have different natural coatings and compositions for various properties such as UV protection or reflection; and many other variables.  Over time glass windows will flow and warp, where plastic windows will oxidize.

Stick-on Window Coverings come in various materials (plastics usually, but that's a wide range of chemical structures with subtly different properties); use different adhesion methods such as static or chemical bond; have different coatings and compositions to create various properties such as coloring, refraction, UV protection or reflections; and again many other variables.  Coatings will chemically change over time.

Light from either side of the window can have different compositions, although usually the concern is natural sunlight.  Sunlight comes from different angles with different amounts of atmospheric interference through the day and year.  This is why it wasn't expected that UV glass can melt siding.

So again, CAN it be damaging?  Sure, anything is possible.

WILL it be damaging?  We really can't say until you install it.  But a bit of very light Googling didn't find any actual reports.  It looks more like an attempt to pass responsibility between window and coating manufacturers.  I'd say check with your window manufacturer, and follow their recommendations.  Ultimately, that's the expensive repair if something goes wrong.