It's not clear at all, not from his quotes above! From that quote I'd say Scotland's lack of competitiveness vindicated his decision rather than influenced it. That's what the Euros reference was about. No regrets...
He didn't even say above that it was Scotland's ambivalance that made up his mind, whereas you say he clearly says it. Maybe he said all this in the past, I don't know.
He said the story is well known. That story, as far as I can remember, is indeed Scotland's ambivalence, I think at Schoolboy level. But that's not the point: I get narked at your occasional sophism. Whether it's intended or not in this instance I don't know but you do tend to muddle clarity and ambiguity quite a bit, and always towards the slant " it's clear he's a mercenary".
I hope you and Paul see that as a fair point, not a baying mob.