Aggregate GDP would increase as government spending on welfare for parasitic immigrants would increase and these parasites would use their gibs for discretionary consumer spending. And seeing as GDP = G+B+C+(E-I) (Government/Business/Consumer spending + Exports-Imports), yes GDP would increase.
However, net GDP per capita (the gold standard when it comes to Quality of Life for an actual citizen, net GDP is important for governments because they have more power on the world stage) would decrease, as taxes would have to be raised on productive citizens, to pay for the parasites (95% of whom are non-white and most go on welfare).
A quick rudimentary analysis reveals that the average wage in Canada in 1995 was $15. Today, accounting for inflation 48%), it would be about $22-23. Today's average hourly wage is $23, so wages have been stagnant for a quarter century.
However, if you look at the minimum wages, you'll see a drastic difference.
In 1995, minimum wage was $6.85 in Ontario. Ontario recently passed legislation that will set the minimum wage at $15.
Now, $15/6.85 = 2.19 = 219%
23/15 = 1.53 = 153%
In 1995, Canada's hourly wage was 219% of the minimum wage, where as today it's shrunk to just 153%, so in actual spending power we've dropped about 30%.
Now in 1995, most jobs (even technology jobs, ala Nortel) had pensions. Ballpark, that'd be worth about $25/day per employee back in 1995, or $3 and change an hour, so in reality workers back then made over $18/hr (about $27/hr today). Then you had overtime (yes, overtime was paid once upon a time). Today, almost no company outside of unionized companies pay for overtime. It's expected 50-60 workweeks are paid out as old 40 hour workweeks are, so in reality today's average hourly wage per actual hour worked is $15 (23*40 hours/60 hours).
So, in reality, in 1995 the average worker made $27+ (because they got paid for OT)/hour vs today's workers, who really about $15/hour.