Sounds like it was more "our team was accepted even though they had no idea what I was up to, I subsequently lost my cofounders, and Y Combinator revised their decision based on that."
I'm surprised that YC accepted "them" after meeting just one of the co-founders. Also, what is not very clear is why he went by himself to get money and how he continued the company by himself without his cofounders. Meaning that it sounds like it's just that they didn't want to move to SF with a week-notice, not that they gave up completely on the startup...