Hi!
Those are definitely not picked up by the plugin, as it searches the database, not the actual visible page content. It may only have been a coincidence – the same keyword probably was within the post content as well as within the footer tags.
But if you do a test, for example if I check post ‘Gunpowder studios’ and pick a random word from the bottom widget that is visible on that post page, like ‘massage’, and try that in the search, it does not return the ‘Gunpowder studios’ post as result. I believe it was only coincidential, the keyword was most likely within the content somewhere, I’m guessing.