A couple of corrections:
ISO per se doesn't support audio tracks, but the old TOSEC ISO dumping method solved that by including dumps as ISO+WAV+CUE, which in effect work just like BIN/CUE files, with the only drawback being that you need more files to represent a disc with CD Audio, instead of the two files of a normal BIN/CUE. Also the frequently cited by certain competitors (Redump, cough, cough) "drawback" of TOSEC ISO being 2048 bytes/sector and therefore "missing" error correction of the 2352 bytes/sector dumps is not an issue, since the old TOSEC ISO only included dumps where two independent dumpers got to same results using different discs, which is obvious to anyone with half a mind that excludes any possible errors of the data sectors. All burners recreate the remaining error correction bytes when burning back such an image.
The really serious drawback was inability to support weird formats, like JaguarCD, PCE, PCFX, CDi-ready and discs with protections.
Also, [idoru] didn't delete the old TOSEC ISO on purpose after leaving. He just didn't renew the subscription to the host (wouldn't make any sense since he stopped bothering I suppose...) and so the site got deleted after said subscription expired. That said, he obviously could have handled his "disappearance" a little more graciously giving others a chance to salvage the old work, which was impossible since noone else had full access to said site.