I know. I've given up memorizing Lakes and Ridges...
Intel is the most confusing. But give AMD some time. (They'll catch up with their naming convention after a few more releases). So, I feel your pain.
This confusion is made worse when system vendors deliberately obfuscate the processor model on their machines. They won't tell you that the product has an i7-8565U -- they'll just put "8th gen" as the processor description. Frustrating!
Intel does have the vega icpu. And Im fairly sure it's the fastest integrated. But as the article points out, who can remember the model anyway. I figured it was meant for laptops. Pretty sure I've only seen it in the nuc. I also agree with best buy making it hard to find what processor you are getting. Until recently there were many laptops on their site that didn't say what gen. But I have noticed you can find that now. Just not by refining the search.
I have many little gripes about Bestbuy. But I will say they are much better than in the past. Their prices are more competitive and they arent harassing you as much to buy extras. Their website was terrible if you wanted to know what cpu you were getting. Now you can at least find it somewhere on the page. You still can't filter for them. With things like a mouse, keyboard, headset or even a laptop it is nice to try before you buy. And for most people they are going to be the only store around.