Very clearly the intent of the Client/Employer to transfer this risk to the Contractor. By deleting these clauses the Contractor has no way of notifying this as a compensation event and therefore this would be their (Contractor) risk.
The Contractor has to carefully read Z clauses at tender stage to understand what risk transfer they are doing - and decide if you wish to withdraw, price risk accordingly or exclude that amendment from the price (which may or may not make their bid non-compliant and discarded)
The Contractor has to carefully read Z clauses at tender stage to understand what risk transfer they are doing - and decide if you wish to withdraw, price risk accordingly or exclude that amendment from the price (which may or may not make their bid non-compliant and discarded)