I can understand his doubts over Nadal but Soderling's mono could have become worse and we saw RF winning a GS even if he suffered from the illness earlier in the year.
To me, Djokovic's transformation into a running machine is a lot more debatable even if the egg is not banned.
The egg was used during 2010, no? Rather than the end of the year/early 2011. I think Nole's ascent to greatness from late 2010 to the present day has myriad factors, far beyond mere improvement in fitness.