I absolutely know people who love companies and products. Like LOVE them, they will be put into tears like a child at Christmas, but they're adults. They grew up with them or their family members died and those companies or products bring back those memories. They played their favorite game while eating that food, etc.
You never know. I'm not sure I've ever loved a company exactly, but I've really really liked a product, or sometimes just a type of food. If I like a certain food enough and only a certain company sells it, some of that feeling relates with the company too. Like the company cheers you up, BECAUSE they sell it. You can see how that might be valuable in spreading appeal for the company and helping preserve the thing you enjoy, so it has social/natural selection value.
I think when companies refer to this, they really are referring to real people, it's just aspirational that other people could feel that way if they let themselves. Most people won't.