No - 60.1(19) is for pretty extreme force mejeure type events of which this is hardly one of them. This certainly doesn't sound like it should be the Employer liability for this issue. I assume there was a good reason for not accepting the equivalent product i.e. it did not meet requirements of the Works Information (Scope under NEC4).
Just a point of note in your question - this will have initially resulted in a delay to planned Completion - Completion Date only moves if you agreed that it was a compensation event and subsequently it was implemented accordingly.
Just a point of note in your question - this will have initially resulted in a delay to planned Completion - Completion Date only moves if you agreed that it was a compensation event and subsequently it was implemented accordingly.