I disagree. I've heard this from people here, however after living here for some time, I believe the reality is that if you don't speak fluent French, you will be at a severe disadvantage.
So my advice to new comers would be to pay attention to this when you visit for interviews. Do you feel reluctance, are people hesitant and searching for words when speaking English? Could be a sign they're not used to it. If they speak casually OTOH (even with strong accent and the odd mistakes) it's likely they're used to it: good.