Indeed, it is an old story, thoroughly debunked any number of times. the problem with any analysis of the situation is that there was SO MUCH information coming into US hands that determining the wheat from the chaff was quite difficult. many of the specific claims made on the cited page are erroneous (like saying of the midget subs " that a training program then under way included towing them from Japan to positions off the Hawaiian Islands, where they practiced surfacing and submerging." This is absolutely absurd. These were secret Japanese weapons. they wouldn't tow them thousands of miles into US waters so they could "practice surfacing and submerging" which they could do in Japanese home waters just as readily! The japanese Striking Force engaged, of course, in complete radio silence during their transit to PH, and so the claim that "US and Britain monitored the Japanese attack fleet all the way to Pearl Harbor" is patently a lie. This web page is a joke.
In any case, the story is ridiculous on the face of it. There was absolutely no need for an American defeat at PH to serve Roosevelt's needs, and indeed the losses ther forced him, very much against his will, to allocate to the Pacific forces he very much wanted to deploy against the Germans. He could have had a smashing victory (presumably, with 4 USN CVs surprising 6 japanese ones who had sent their planes against PH) and gotten the US into the war against Germany as well.
Although, since it was Germany who declared war on the US and not the other way around, I am not sure how this conspiracy was supposed to have helped Roosevelt in his desires to get at Germany!