A couple of points to note;
An EWN is not a compensation event notification,
and
The 'time bar' under clause 61.3 starts when the Contractor becomes aware that the event occurred, irrespective of when they believe that it constitutes a compensation event.
The 'time bar' issue may not be the only response, as the PM can notify under clause 61.4, 1st bullet, that the event arises from a fault of the Contractor, so the Prices, Completion Date and Key Date are not to be changed..
I am also assuming that the Contractor has clearly explained why they believe the matter is a change to the Works Information, within their notification.
An EWN is not a compensation event notification,
and
The 'time bar' under clause 61.3 starts when the Contractor becomes aware that the event occurred, irrespective of when they believe that it constitutes a compensation event.
The 'time bar' issue may not be the only response, as the PM can notify under clause 61.4, 1st bullet, that the event arises from a fault of the Contractor, so the Prices, Completion Date and Key Date are not to be changed..
I am also assuming that the Contractor has clearly explained why they believe the matter is a change to the Works Information, within their notification.