Can an Expert Determination determine whether change requests are correctly claimed from a scope, quantum and extension of time perspective

Yes, depending on the scope of what the expert is engaged to determine.

We have substantial experience in dealing with complicated technical projects (for both hardware and software architectures) and the usual complicated interlocking change requests, the calculation of the correct quantum for such change requests any consequential extensions of time which should (or should not) be granted.

It is important to note that many change requests in effect need to legally and technically properly construed before the correct determination can be made.