It's a good job he's not bitter
My dog could win a trophy battling me for a tennis ball in the back garden, it doesn't mean it's worth anything to anyone (certainly not me), and the dog doesn't even want it after he's got it either.
Yes, they "play" European football, but it's hardly earned, as the competition outside the top two spots have <10% of the resources, and they rarely respectable in such competitions. They won one game in the group stage of the CL last year, and most years they get knocked out a the group stage. There's a big difference to playing in Europe, compared to winning as many as you lose, and even more than that to get in a Semi Final or Final.
They're probably one of the most well supported full time clubs in Europe, but the amount of games they win compared to other clubs of the same size is laughable, which is why nobody outside Scotland is fussed about them. >90% of their SPL games are effectively walkovers, and recently they're losing all the games against Rangers. Only took two years of Rangers being an SPL club, to overtake and dominate them again. Effectively they're bottom of their two team league and out of the CL in the second qualifying round, so how is that expected to appeal to most players?
They sometimes put up a bit of a fight against English clubs, I'll give them that, but they treat it like their biggest game of the year, where as their oppo just treat it as another game.
They would be below us in the Championship, if they were in this league, and if we got in the prem that's a level which they'll never get to, and have never been at.