nobody said that, mate. and even if someone did, he was obviously wrong.
point is different. the main reason why super league was pushed is that these clubs would want to invest much more into football, and could get much more revenue. ffp and the current "equal and fair distribution system" are archaic and doesn't help progress. clubs want to invest, to buy better players and even overpay them? they can't, see ffp. clubs only get a fraction of the potential income because uefa is the worst kind of corrupt, greedy and archaic middleman. apparently there's much more money in football than uefa allows clubs to get access to. some prestigious clubs make the whole show, and their contribution isn't properly rewarded, simple as that.
so no, the whole sl stuff has nothing to do with juventus' current results. pirlo, paratici, sarri, ronaldo and fucked up purchases like arthur or ramsey happened way after the whole sl idea was born, and these questionable management decisions are irrelevant compared to what the sl could potentially become in a decade. watch tici get access to a bigger transfer fund and make the same idiotic decisions for proof.

club football needs a better distribution system, and juve need a better management, the two are unrelated issues.
i love traditions, i prefer 90's football to this plastic mess, i'm pretty sad about juve losing its identity, still, uefa is the last organization i'd feel sorry for. they screwed it, and agnelli, perez and all the english clubs warned them plenty of times already. uefa (and fifa) should be small, professional, mainly administrative organizations ultimately serving the sport, which they clearly aren't.