Okay, for starters, as I pointed out in my original post, the chords are supposed to be rolled throughout. That is the way Debussy played his own music.
Even though, he didn't record this particular piece, he rolled practically every single chord in those works that he did record.
Second, what I do is to roll the first chord and hold the F with my forefinger while playing the second D octave. I then release the forefinger and then play a rolled third chord.
One needs to determine what is the compositional goal is here. By examining two measures before, it is evident that he is trying to establish the harmony of a B Flat seventh chord in both instances.
By showing the whole note F, he is telling the performer that the surrounding C octave chord is a passing chord used to give the section further movement. And, considering the "piu crescendo" marking, if played properly, there is no way you are going to hear a held over F anyway.
Debussy was described as using something called "overlapping pedaling," which is a nice way of saying that he used a lot of pedaling throughout his pieces, even often pedaling through the rests.
In this measure, if you hold the pedal for the entire measure, then you have your whole note F. Me thinks that is what the composer had in mind because in the two measures prior, he uses a half note in the first chord of the measure, indicating a change of pedal on the third beat.
Finally, for those who missed it the first time, I list the link to my original post. I highly recommend that you listen to the Debussy examples in Part II.