That's not true at all, if you look where Juve was before Conte and if you look how he and his staff build their team with not much money, no way Moyes could do that. Napoli spend not less this summer than Juve did in the last seasons and he didn't just won the titles, he won it unbeaten in his first season and now with maybe 102 points, which is impressive.
Also this failing in Europe is not really true, he got them to the QF last year, just lost to an amazing Bayern side. This year was shit in the group stage, but you can't call him a bottler in Europe, he already achieved more in Europe than City has in the last few years.