Actual results of course differ from theoretical results, because humans have the ability to use anti-computer strategy. But it's hard to say how big the effect is, because we have 3 unknown variables.
1) human's skill in employing anti-computer strategy. Positional players and those who are more experienced with playing against engines have advantage.
2) engine's susceptibility to such strategy. It seems to me that search depth is the most important factor. Which means, keeping time and hardware equal, better search algorithms with smaller branching factor can better cope with it.
3) the extent a certain positions allow that to be used. In open positions it virtually doesn't matter how you play; it is outcalculates you, but closed positions offer plenty of opportunities to build up your position without the engine having a clue before it's too late.
As time passes and advances in the search function and hardware, the gap between theoretical results and actual results diminishes.
Moreover FIDE players under 1500 are extremely weak and should be weaker than their equivalent in CCRL not vice versa as the table shows.
What makes you think so?
