Could something like this cause IPF?

My father passed away a few years ago, after being diagnosed with IPF only about 1-1.5 years before passing. He had no past of being exposed to anything hazardous. His pulmonologist couldn’t ever figure out what could’ve caused it.

He was diagnosed with sleep apnea probably 15 or so years before passing, and used a CPAP nightly.

He eventually developed a nasty cough that never went away, and was finally diagnosed with IPF.

I’m not looking for any sort of retribution, more just possible answers or even just clues, since it’s not clear whether it was related to anything hereditary (I have 3 siblings).

And to be clear, I’m not even sure what brand/model he used (though my mom would likely know). So there’s a decent chance it’s unrelated.