So far only the new Leon has tsi with cam belt.
Yes the new generation EA211 1.2 TSI and 1.4 TSI engines are using a Cambelt but these are only fitted to the Leon. The older 1.2 TSI fitted to the Ibiza has a chain.
Seat Ibiza 6J 1.4 16V 85HP has chain or belt?
Belt and it must be changed every 4-year/ 40k miles. They are seriously weak on the 1.4 16v and when they go cause catastrophic engine damage.