I pointed out that the advice is an excellent safety item for VFR pilots. You have gone looking for a rebuttal and, sadly, picked the wrong topic.
If you need a second, CASA, reference - try
http://casa.gov.au/fsa/2005/aug/34-36.pdf
You will find there that Mike Smith - good guy - provides a CASA flying ops perspective that ACKNOWLEDGES exactly what I stated about many people using GPS for navigating WITHOUT THE NEED TO BE GPS ENDORSED for appch or NVFR.
(Edited to add - re-reading this, it is a bit ambiguous, what it is meant to state is that one can fly VFR using GPS without the need to obtain an endorsement as for appch or NVFR)
You may then care to read the CAAP mentioned in Mike's article - try
http://casa.gov.au/download/CAAPs/ops/179a_1.pdf
You will note the applicability to day VFR therein (page 21), and also check the table on page 27.
Particularly note 'pilot qualifications' on page 28.
I certainly accept CASA is the regulator - so do they and their instruction on VFR navigation acknowledges exactly what is in the earlier information I posted, which from memory began life as an AIP SUP or similar, therefore having been through CASA first.
If you are interested in getting the facts, rather than following me around trying to discredit my posts and/or provoke me, you will find the links above worth a read to increase your knowledge.