Of course. Every opinion is just the opinion of whoever says that thing. Including those who say they like the new colours.
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Numbers don’t speak, they are just numbers (and to be fair we don’t have any number as this is only an unconfirmed rumor and will stay that way as Apple don’t disclose this information anymore). Even if these numbers were real it could be due to a other reasons, for example people might buy the new colours just to show off (they can afford the latest product) rather than because they actually prefer it. As you said it’s all opinions, including those who consider these colours appealing. We can’t know if and why these colours actually make more sales.
since we are at it I’ll also say that I will also be getting an iPhone 11 (non pro), and it will be green. Do i like it? No. And yet my sale will go towards these numbers that supposedly speak (spoiler alert: they don’t). In my case it’s just because after many years of black/white iPhones I want some colour. Last year I got the blue and I’d have bought it again, but they removed it. I find all the other colours horrible and green is the only half decent one, so I’ll get that. Do I think it’s nice? No, but they don’t offer other choices and I wouldn’t lose a chance to upgrade for the sake of a colour.
so yeah, long story short: numbers don’t prove anything, they can be interpreted to support whatever opinion the person mentioning them wants to support.