Here, let me make a few corrections and add a few details:
I'm not sure what exactly your point was by sharing this. The article clearly states that:
1) The group of Chinese-Canadians in question benefited from the free and subsidized education Canada affords;
The group of Canadians benefited from the free and subsidized education Canada afford, which was paid for partially with their parent's taxes;
2) Left Canada as soon as the education was completed, thereby never contributing any portion of their income to the Canadian economy (through taxes or otherwise);
Took the best jobs they could find that used their education, like all Canadians do when they graduate.
3) Have no intention of returning to Canada in the near future; and
Are working at those jobs, saving money, developing skills, and planning how to use their combination of Canadian and Chinese expertise;
4) Would like to move back to Canada much later on (i.e., close to retirement) when they require Canada's healthcare system and when their families require free or subsidized education.
Aren't thinking about retirement at all, owing to their being young Canadians; if they return for retirement, they'll bring the assets of a lifetime of productive professional work; feel a connection towards Canada, which is normal for people born, raised, and educated in Canada.
So, somehow, you are arguing that because these people feel "Canadian", it's ok for them to be a burden on the rest of us? Do you think your tax dollars are well spent supporting them?