To understand better:
Peru finished in 4th place, but if Ecuador loses the spot, it will lose the points to another teams, 8 matches to be precise.
The new chart will put Chile in 4 th place, so the spot would be to Chile, not Peru.
To be honest, I think FIFA will punish the player Byron Castillo, he will pay some fines, be out of a lot of matches, but FIFA will keep Ecuador on World Cup.
If Fifa decides to punish Ecuador, Peru and another teams will probably see a chance to fight to the spot and will be more complicated.