Canada has seen a major influx of asylum-seekers entering the country in the past few months, since President Trump introduced a travel ban on refugees and migrants from seven majority-Muslim countries.
In the first two months of 2017 around 1,700 refugee claims were filed at the Canadian-US border, according to the Canada Border Services Agency. More than 7,000 refugees entered the country by land in 2016, an increase of 63% compared with the previous year.
The above is from the OP's link. It sounds a little like they're not all illegal farm workers from Central America. I could be wrong.