Don't think that's right, reported it was only if we qualified for CL that season and we negotiated the fee down.
Never clear on that as we qualified for CL in his first season at Spurs not 2nd season and the loan ran for a minimum 6 months with a possibility of 18 months.
So in theory we could have tried to exercise the break clause after 6 months only to be told an obligation to buy has been triggered but if you want an extra loan for a year that's fine
Without the detailed wording of the clauses its impossible to be sure : but we did buy him at end of 18 months, whether legally as an obligation or option unsure and it may have been at a compromise price as the wording of clause was imprecise and neither club wished to go to court over it.