Well since the problems only started right after the timing belt change, the changes are pretty high it's caused by a bad timing of the camshaft.
About the chiptuning. That 1.9 TDI engine has the PD, which are also driven by the camshaft. This adds an extra strain on the belt. On top of that the belt has to deal with the added torque of the chiptuning. Such things don't help reliability, but you can't blame it for the cause of the blown engine, it only may have helped the scale of the damage.
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