I have known Cremieux for a long time, and trust him a great deal when it comes to handling and presenting data. In any case, I don’t know what standards you’d find satisfactory. He made the graph out of data he listed on the graph. Anyone can go and verity its accuracy. It being materially wrong would be devastating to his reputation. Thus, if you still don’t trust it, you should just do your own leg work to verify it, instead of asking others, whom you probably don’t trust any more than you trust Cremieux, to do it. Anything more would be unusual and unreasonable, even formal academic peer review does not involve verifying that the graphs are accurately representing underlying data.