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How is this "give a single image as proof"? It's not a single image, nor is it given as proof. The study involved lots of images tracking nearly a dozen different sites, and the changes observed are attributed to climate change (and even then only with the caveat of "possibly and likely"), not presented as proof of climate change.

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Sorry, I was directly translating from my language to english and it could mean a different thing in english.

I mean that in the way as giving just an image (as in no other data like temperatures, CO2 levels, etc), makes it easier for science deniers to nitpick out of it.

You're right that the image is just one source of data. But... that's true of any one source of data. This data doesn't prove anything, it just contributes a bit more evidence (to an already enormous pile...).

It's not "an image". I gather that they've analyzed many images, and are extracting information about vegetation from them. The result is data.

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