The Satipatthana Suttas are fake dhamma. Bhikkhu Sujato called the Satipatthana Sutta the "Piltdown Sutta". "<a href="https://en.wikipedia.org/wiki/Piltdown_Man">Piltdown</a>" was a term used in a certain scientific fraud. 

It appears obvious by the content of the Satipatthana Sutta than the term "Dhamma" refers to various "teachings", "principles" or "truths" of the Buddha, such as the seven factors of enlightenment and the four noble truths. 

Since the development fruition of the seven factors of enlightenment and the realisation of the four noble truths are permanent in the mind of an Arahant, obviously these dhammas cannot be subject to passing away.