There is no doubt that the cam timing is off, probably by one tooth. The difficulty is determining if it's advanced one tooth or retarded one tooth.
With the cam cover off, bring the engine to TDC on number 1 cylinder.
Looking at the cam lobes, they should be pointing at equal angles away from the center. This should tell you if it's retarded or advanced.
Because it has no power, I suspect that it's retarded. But go very slowly and carefully. The valves are already touching the pistons. If you go the wrong way, you will bend the valves if they aren't bent already.
When you get the cam belt reset, take out the plugs and turn the engine very slowly by hand and check for any resistance. Once you are convinced it's correct, do a compression test. If the valves are bent, they aren't bent by much but you will probably see low compression across all the cylinders.
Every technician has gotten the cam timing off at least once, including me. It's very easy to do. Hopefully that's the only problem and no other damage has been done.
Thank you in advance for accepting my answer. If you feel that my response isn't helpful, please let me know and I will release your question back into the list.