Is Artorias boxing the channel which has a bunch of videos with completely absurd punch counts (the one which had Pacquiao beating Mayweather comes to mind)?
Anyway, 40 is pretty barren at the moment, so he could probably beat a number of guys there (a decent pressure fighter with power and size, maybe a guy like Regis Prograis, could cause him a lot of problems that high up in weight). Lomachenko did have real issues with Linares' size and power (and Linares isn't excessively big or powerful for 35), so I don't give him any real chance against a guy like Spence at 47. That would be a slaughter and Lomachenko simply doesn't belong that high up in weight. So I see 40 as his peak, and I think he could get into some real trouble at that weight if some quality comes into the division in the next few years.
Edit: yeah, the video is by the same clown I was thinking of.