"we noticed that the www.kogan.com website stopped appearing in organic search results on Microsoft backed search engines"
They don't say explicitly, let alone prove, that the result ever appeared on Bing, while "stopped" would imply that.
If the comments about the wrong robots.txt got it right, it is well possible that the website was never indexed by Bing, and they just noticed it (or decided to talk about it) now.
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"we noticed that the www.kogan.com website stopped appearing in organic search results on Microsoft backed search engines"
They don't say explicitly, let alone prove, that the result ever appeared on Bing, while "stopped" would imply that.
If the comments about the wrong robots.txt got it right, it is well possible that the website was never indexed by Bing, and they just noticed it (or decided to talk about it) now.