If we find the median item on this list we get #117 which is Central African Republic with a population of 5.7 million or 0.07 % of the global population.
It would be very easy for a large multinational to ignore the smaller nations and focus their efforts on the larger markets.
It's apparently in 73 countries. So it seems the number quoted here includes a lot of non-countries, such as parts of countries (e.g. South Georgia and the South Sandwich Islands, which has no population and is a territory of the UK).
So it's still bad, just not as bad as the post title makes it out to be.