I can't speak authoritatively for Canada, but in the USA 'posh' is a uncommon word, I associate its use with UK English. I have also never heard of this company

I can't speak authoritatively for Canada, but in the USA 'posh' is a uncommon word, I associate its use with UK English. I have also never heard of this company, so I'm somewhat skeptical of the claims in the article. I'm guessing that although the company was founded in NA, the use of 'posh' is related to the founder being Indian, thus acquiring UK English word associations.