What? Are you making stuff up? Solskjaer was manager from 2011 to 2014 - at which point he went to Cardiff. During that period he knocked Rosenborg down and won the league in 2011 and 2012, then they had one mediocre year in 2013 due to player escape among other things (that's usually the case when small teams makes a success of themselves) but that year they won the cup for the third time in their history so he still managed them to success and also secured a spot in Europe (which is a big deal with those limited resources)...
Also even though he left the reins to someone else and went for Cardiff in January it was still the team that he built which reclaimed the league in 2014. "Not able to replicate?" They turned the dominant team in Norway during his first tenure there - leaving Rosenborg who've been miles ahead of everyone for decades and are vastly superior in terms of both renown and resources trailing. The moment he left they fell back to their usual selves but he made pretty much instant impact the moment he returned late 2015 - winning all their remaining games and even finishing first in the Europa League group stage ahead of Fenerbahce, Ajax and Celtic (not bad for a team from the "farmer's league"). They were knocked out by Sevilla - who went on to win the whole thing.
2015 saw them a little better at 5th, and by 2017 they were back at 2nd again which is where he also left them at in 2018 - with the gap up to Rosenborg diminished from the previous season even breathing down their neck. The team that's currently leading the Norwegian league is his - and they're where they're at due to his influence even though he's not the one in charge any more.
You'll have to be very convenient with the truth and make a lot of weird stretches outside the realm of logic to describe him as a flop in Molde - seriously... That's pretty much the dumbest make-believe I've read in a while. Admit it - you just hate the guy don't you? Clutching at any straw or even inventing a few to present him in the worst of light? Well good luck with that I suppose - it's your integrity down the shitter not mine