Your sentence sound right

U should know what happen when u see all the houses with price range 660k - 680k are posted by a same agent, no?

Sounds good ya. New launch has better specs, larger BU, and pay later.
Though it is like 200k more ( 30% leh).

Though 660-570 = 90k gross gain.
MOT, lawyer fee, bank penalty (early settlement) =30k?
Interest cost another 20k?

this means 40k before RPGT, left 30k.
not really a good yield by flipper, though he might wanna cash out early due to current glut.

Have i miss any points?

The 660k unit i doubt is even exist. U may check with that agent whether the unit is still available. Perhaps she will tell u the unit is still available but when u go for site viewing, tarak... no harm to try,  really a good buy if 660k...