The are the facts. How did Ontario suffer because Alberta prospered? Since when does one part of the country suffer when another prospers?
Without using the phrase Dutch Disease, the OECD report says “income has shifted towards the resource-rich western provinces, while the regional economies of Ontario and Quebec are still adapting to increase external competition resulting from the high exchange rate.”
“The export-oriented manufacturing sector had by 2011 shrunk sharply to only 12.6% of total value added, down from a peak of 18.6% in 2000. Its share of employment has also fallen substantially over the past decade from 15.2% to 10.2%, and somewhat more than in the United States,” the report says.
“Both outcomes have been clearly correlated with exchange-rate developments. Regional growth disparities … mirror these divergences in sectoral activity: the resource-rich provinces of Alberta, Saskatchewan, and Newfoundland and Labrador have enjoyed the largest per capita income gains during the past decade, whereas growth has been more sluggish in the manufacturing centre of Ontario.”
https://financialpost.com/commodities/energy/oecd-sees-signs-of-dutch-disease-affecting-canada----
Thankfully, that situation rectified itself. The rest of the country (BC, Manitoba, Ontario, Quebec) have actually done far better overall under low oil than when oil was high.