No, it isn't. There are a lot of people of Chinese ethnicity in Vancouver but it is nowhere near the dominant fraction. But there is a very nice Chinatown (great food).
The ethnic 'whites' are about 50%, ethnic Chinese is now ~25%, it was quite a bit lower when I was still living in Canada so it was definitely on the rise but the increase seems to have leveled off.
Some externally sourced data that more or less confirms this: