That was only the first domino to fall.
In the basic architecture of the turbine section, the IPT system could not tolerate a shaft separation; It was virtually guaranteed to overspeed until the disc burst. That is a basic design issue; the manufacturing fault in the oil tube was merely the straw that broke the camel's back.
Of course they have addressed that little detail by changing the architect of the FADEC
I hope their FMEA analysis shows that good engines will not be shutdown erroneously with this doomsday code