No, it isn't, you don't have the math right here
Every game in itself has its own odds, so when the team are assumed to be the same strength it's a coinflip, independently of what happened before (see my argument that events are independent - meaning that it doesn't matter if you won the CL already two times before, the odds for one particular game are independent of that - you could argue that there's a correlation between the amount of CL wins and the strength of the teams and thus one should be more likely to win the game, but I tried to keep things simple for the sake of the argument, but even in this case it follows the same logic). I talked about the overall event, winning the CL three times in a row.