Here's a very straightforward guide to buying honey. If you see honey at a supermarket, no you don't, that's sugar syrup. If you see honey online, no you don't, that's sugar syrup. If you find an old dude with a small stand and a bunch of (most likely unlabelled) jars who only accepts cash, that's where you get real honey.
But all the honey labels say the only ingredient is honey. We've always been able to assume that with things like jams, or any other food, when manufacturers adulterate it with things like corn syrup, or even mild poisons, they proudly say so on the label. To not do so is fraud. How can people just claim that an entire industry is committing fraud??? Even this article doesn't mention anything about proof, just suspic…
I assume that the notion of adulterated honey is new to you and that you’re not in the industry. This has been an issue for decades, it’s nothing new. There are commercial honey producers and packers that are clean but the easiest and surest way to avoid fake honey is to buy local.