Your fact check:
Doesn't seem particularly complete.
I wonder why you avoided mentioning Sweden, which has been theoretically committed to joining the Euro since 1995, held a referendum on joining in 2003 and subsequent to that "No" vote has carried on with its own currency since?
Also, although you mentioned the 3 most recent EU members not using the Euro (Bulgaria and Romania since 2007, Croatia since 2013) you seem to have forgotten to mention there are 3 others (Hungary, Poland and the Czech Republic, since 2004).
So that's 7 countries not using the Euro with no opt-out. Of those 7, only 2, Bulgaria and Croatia, have a government policy of moving towards Eurozone membership.
I would have thought that making a statement like:
"As it stands, it’s unlikely an independent Scotland would be able to avoid adopting the euro indefinitely."
... when there is actually an example country that has not joined in 24 years and has declared it has no plan to join, is more of an opinion than a fact. And an opinion based on pretty shaky ground.
My fact check of your fact check: "could do better". :-)