The vast majority of the "Lowland Scots" were English, not Scots, in both their ancestry and their customs. The English began planting immigrants in Scotland under Edward I. Virtually all Monarchs from Edward I onward gave titles, English lands, and wealth to the Scots Nobility. This was to bribe them into supporting England, and NOT Scotland; or at a minimum, staying "Neutral".
Unfortunately, Blackleaf has a VERY distorted view of history, and slants virtually everything into his pro-British viewpoint. So, he interprets virtually everything that concerns England (or the USA), as something that the English are superior at.