Timing chain in Toyota Camry

I think what they're talking about is an interference motor where the piston may hit an open valve if the timing belt breaks .

That's exactly what they're saying. The best thing to do is visit your local Toyota Dealer with your VIN and they can tell you if you have an interference engine or not. If you do have an interference engine, junk it. In my opinion it's not worth fixing. But if you don't have an interference engine have the repairs made and continue on your way. The first thing to do if you suspect a jumped timing chain is a compression test. If all cylinders test very low or zero the timing chain has jumped. But if you have good compression, it's not the timing chain. Hope that helps! Jim