In the Catalan independence referendum, 2,044,038 people voted in favour of independence, out of a total registered electorate of 5,313,564. That means 38.5% of the electorate voted for independence - a slightly higher percentage than Leave achieved. It would of course have been even higher if Spanish police hadn't stolen votes, closed polling stations, and used violence to prevent people from voting.
In fairness to Kenny, I saw the fake Sturgeon tweet when I did a Google search last night, and although I was dismayed by it, for just a split-second I thought it might be real. It was the "to be clear" that did it - that sounds like Sturgeonesque language. But when I thought about it I quickly became suspicious and decided to check, because I realised that an explicit rejection of the mandate for independence would have directly contradicted what she has been saying for weeks. It tells us quite a bit about Kenny's fundamental misreading of the SNP that he didn't become suspicious about a tweet like that, even after reflection. In reality, given the strength of feeling about Catalonia, there were only really two options open to the Scottish Government - either offer a symbolic "recognition" of Catalan independence (even though a non-sovereign country like Scotland has no power to recognise a state), or just opt out of the problem by neither recognising nor disputing the independence declaration. They've gone for the latter option - I'm not sure that will be enough to satisfy most SNP members, but I can certainly understand why they've done it.