NEC ECC: Costs of assessing change(s) under NEC3 permitted ?

After receiving a significant amount of additional documentation from the client through various PMI's and addendums, the employer provided a register consolidating all the contract works information, site information & PMI data, along with access to the additional documentation, and instructed the following: -

‘In order to bring all of our Consultants and Sub-contractors into alignment on these documents you are instructed to incorporate them into the Works and Site Information against your appointment.'

The Sub-Contractor provided a quotation for the assessment of design implications and the alignment of works & site information.

As per the employers response: -  

'For clarity (-removed-) do not accept the quotation provided for the cost of assessing the change as this is not permitted under the NEC3 contracts.'

Reference made to NEC3 clauses - 63.1 & 11.2

Is the employer's statement correct?