Not impossible, highly unlikely. Lets give it the benefit of the doubt.
The only way I would see this as possible is if the seed is started in July somewhere like Cali or anywhere where it's warm all year round.
Tons of flood lights around the plant so even at night it stays in veg.
Veg for nearly a year, then when the seasonal 12/12 starts turn off the flood lights and let it flower like normal.
I don't know how big a plant will get with 1 year veg but it must be massive, and then flower stretch will probably make it even bigger.
That would make it possible to get 12lb no?
Regardless BC seeds is a scam (The way I see it) they charge crazy amounts for seeds that seem to be the impossible 35-50% THC. If they were that high wouldn't they win the cannabis cup like all the time?
34% on BC sites and that site you listed (BC site being a bullshitting company to most always lying)
http://www.mjspectator.com/strain_view.php?ID=1538
says it's only 20%