What i think is that maybe he misunderstood what was written in the message, or maybe the monk who wrote it got things a bit wrong :S im sorry im not trying to say that im 100% correct but i will be sharing my opinion.
What the phrase actually meant to me is that this is a text that is extracted from Dhatu Manasikara - the meditation method. Where lord Buddha asked us to see Earth as Patavi(hardness) element, Water as Apo(watery- which flows) element, Fire as Theyjo(heat or cold) element and Wind as Vayo(movement or wind) element.
Where our Nails, skin, hair, muscles, eyes etc drops into the catagory Patavi element.
Our saliva, urine etc falls into Apo element,
the Warmness of our body falls into Theyjo element,
and lastly Breath that we take in, the air thats trapped inside our ear and also the air that travels upwards as well as downwards in our body drops into the catogory of Vayo element.
Hope this will be a fair answer for you
We die someday.