What does Verified even mean?

I picked up Trails in the Sky 1st Chapter in the Summer Sale. Been wanting to play it since release. Says it's Verified, which to me means "open the game and play the game" but that's clearly not the case here, as the opening cut scene runs at an excruciatingly 10 fps. Now I'm googling if it's a proton issue, yada yada. I'm not above tinkering, that's part of why I like being a PC gamer, trying to get the most out of the hardware, but when it says Verified, I expect it to work out of the gate.