Ah but I don't think that, there are plenty of other ways you benefit from favourable refereeing throughout a match. Penalties both for and against are merely the most glaringly obvious examples, season upon season.If you're actually naive enough to think the only way bigoted refs give a team wins is by giving them penalties, then it's clear evidence you've never actually played the game at a serious level.
Last year Rangers made it to a European final ...emmm... no bad, eh, son!
How well has Angie's, the odds on fav for Spurs manager, team performed against Euro competition, eh!
As for European performance, yep you did well to reach that final. It all clicked for you. And then this year your team of shitebags followed it by having literally the worst UCL group stage in history. Zero points with the most goals conceded, ever! Congrats on the new world record!

Regardless, I'm sure we could argue all day about who is shitter in Europe. But how Celtic does against the Real Madrid's will have little bearing on whether Ange is or isn't a success at Spurs.