Yea, in the ITT he lost 3mins, during that attack he got 2.40 back, in the end he was 2 mins ahead of Honchar in the GC, so about 2.20 he gained mostly with his attacks shortly before the finish line, and time bonifications. That way Honchar lost a few seconds to Cunego and nearly every mountain stage. So without Falzes he would have been about more than 20s behind Honchar in the GC, it would have been pretty close. But it's not impossible Cunego could still have made it, he was in fact very strong during Falzes stage, he could probably have attacked on the last climb and gained just enough to put him slightly ahead of Honchar if everything played out just like it did.
Overall after rewatching that Giro on youtube recently, I gotta say the field wasn't very strong, Simoni wasn't as good as the year before and probably couldn't play all his cards cos of Cunego being his teammate, a rider like Cioni came in 4th, a Garzelli far from his top shape was 6th and also for Honchar it was the only time on a GT podium.
That being said an asterisk could also be attached to Bernals tour victory, gained most of time on a shortend stage, teammate of Garraint Thomas who was very much playing Simonis role...