Towered
Superstar
The answer is No.
The fair comparison to the GGH is the London Metropolitan Area, which is currently at a population of 14,257,000
London metropolitan area - Wikipedia
en.wikipedia.org
The GTAH probably will overtake Greater London (not the Metropolitan number), but the GGH is unlikely to overtake its comparator, at least in the next 10-15 years.
That said, currently, the City of Toronto is growing much faster than those numbers cited above suggest. We're likely to hit that 2041 number by 2031 at the latest and maybe a few years sooner.
That chart needs to seriously be updated - it's projecting a 416 population of 3.19 million by 2031, while we've already reached 3 million in 2020...