Yes, that article is indeed confusing. I was mostly interested in the stages of insight because meditation techniques where sensations are observed are — as far as I understand from my research — based upon these 16 stages.
Besides breath and kasina, these 16 stages are then perhaps also a mixture of Buddha’s teachings and Vedic teachings, I conclude.
EDIT: I just stumbled across this:
“…the sixteen stages of knowledge are found in the Patisambhidamagga. – yuttadhammo”
So are these 16 stages in the Patisambhidamagga then?