The most likely explanation here is exactly what Levant said: Huawei Canada paid those people to be there. Considering that Huawei Canada is simply a tool of the Chinese Communist Party, it would be easy enough for them – or an organization connected to them – to pay some chumps to hold up their signs.

https://www.spencerfernando.com/2020/01/20/watch-pro-meng-wanzhou-activists-really-seem-like-paid-protesters/