Then Bendis is an idiot, since Dr Strange used Chaos Magic for years in his own book. Perhaps an editor should mention that to him.
And as former Sorcerer Supreme, Strange really must possess an more than average knowledge of all kinds of magic. Even Black Magic. Strange himself said when he was looking for an replacement, that good or evil don't have much meaning as job requirement for the Sorcerer Supreme. That said, he hoped the next chosen one wouldn't be Dr. Doom.
Strange used "Catastrophe Magic" in his own book, in the mid-1990s era people are thinking about. I guess this is how comics-urban-legends start; no-one was actually reading Doctor Strange at the time (thus it getting cancelled), so someone who was either misinformed/mistaken/wrong, or deliberately lying, starts this "Strange was using chaos magic for years" thing, and six years later, it's still widely believed to be true.
At the time of Disassembled, the guy who was apparently the biggest Strange expert on the Internets went through his entire collection, and verified that before the Scarlet Witch's powers were re-defined in 1998, there was one, and only one, mention of "chaos magic" in a Marvel comic, and it was a fill-in issue of Doctor Strange, resulting in a conclusion that was essentially "the reveal that there is no such thing as chaos magic contradicted only one fill-in issue, which was barely in-continuity anyway. If this is the major impediment to people's ability to enjoy Disassembled, they have problems."