I think that has been mentioned about a million times already, in this thread alone.

At any rate, even if the general idea is right, comparing the rating of a computer chess program with a human player directly doesn't tend to work very well, due to the way ratings are calculated¹ - basically, there aren't enough high profile computer versus human matches for that to provide very accurate information by itself (though, again, it's undisputed that computer engines can be much stronger than human players).

1 - see https://en.wikipedia.org/wiki/Chess_engine#Comparisons, below the engine's table.