[btilly]

No, the person that you're responding to is correct.

When someone from British Columbia says "interior" they mean anything past the coast mountain range. This is a semi-arid climate that didn't readily support any of BC's large tree species, namely red cedar, douglas fir, and sitka spruce.

It doesn't matter how many pictures from a century ago that you have of big trees inland, or on the west side of the first mountain range. That's not the interior, and isn't relevant.