GIPS - SPONSOR? Investment, accordance, individual, single

NakedPuts

"Statements referring to the performance of a single, existing client PORTFOLIO
as being “calculated in accordance with the Global Investment Performance
Standards” are prohibited, except when a GIPS-compliant FIRM reports the
performance of an individual client’s PORTFOLIO to that client. "

This is from the GIPS website.

So is this what they mean by sponsor specific?