20 Albert Embankment - tiny planning permission amendment

A request (10/03287/FUL) for a tiny amendment to the planning permission for 20 Albert Embankment has been submitted to Lambeth Council along the following lines:

"The planning conditions as currently worded require the submission and approval of the relevant details to/by the local planning authority "prior to the commencement of building works". The variations seek to substitute the words "Prior to the commencement of building works" with either the words "Prior to the commencement of the relevant works" or "Prior to the commencement of works above ground" (as appropriate) to allow for a staggered submission of details."

I don't know enough about planning law to know why this type of amendment would be required.  I suppose it all hangs on why the building details can't be submitted prior to works? I'm not sure why details would need submitted in a staggered manner?  Is it a stalling tactic?  Do Newlands Enterprises Ltd wish to hold until the market recovers or do they want to wait to hear from Lambeth about one part of the building before submitting the details for the next?  Questions, questions...