Gianni Sant Singh Ji Maskeen basically said all of that is false we believe in the four yugs but not in that way. Maskeen Ji said that the yugs dont come in a linear fashion one after another but rather theyre all here at the same time depending on the state of mind of the humans that live in them for example although the majority of the world is in kalyug when your in the company of true sants that is satyug. Maskeen ji also said that at one time one yug is predominant over all others right now kalyug is dominant over all others and the time it takes for the dominant yug to change is roughly 2500 years not lakhs of years like hindus claim, now I dont remember the details(its been a while since I've heard the katha) but maskeen ji uses bhai gurdass jis varaan to prove this.
They also said that the four yugs can be used to to represent the stages of a human life: Satyug is the gestation period when the baby is in the womb and connected with god and desires nothing else, Tretyug is childhood when although the innocent child feels no lust it has a desire for power i.e greed for other childrens toys and a stubborn refusal to share with others, Dvaparyug is youth when a young works to earn a living and gives in to lust to create future generations and finally kalyug is old age when the fires of all the unfulfilled desires burn the mind and render him incapable of remembering god.
Again its been a while since I've heard the katha so I paraphrased alot of whats been said and left alot of things out