First of all, before your loving gentle-hearted Mama goes on an educational bender, props are warranted:
Harvard has been around for decades, quietly making a ton of private-labeled chemicals for many large, well-known companies. I've even carried some of their products here myself, and used them too. They're a solid workhorse in our industry - they don't have flashy sales or nifty gimmicks, they don't have smexy logos, they just do what they do, sell what they sell, and go home to their families at the end of the day. I wish more companies operated in such a calm, structured, simple way. Harvard doesn't make waves. They provide what is needed, to whoever needs it, without fuss. I adore them.
As for "optical brighteners" - don't let semantics trip you up. Think of it as a phrase equivalent to "degreasers", "detergents", or "deodorizers". The term optical brightener can be applied to any of dozens of chemicals, some of which are quite dangerous and some of which are quite safe. Optical brighteners don't just brighten, either - they can have other cleaning purposes, and the "brightening" factor may simply be a lagniappe, a bonus.
As for the tell-tale fluorescence... virtually any phosporus-bearing compound will emit a glow under UV light, and thanks to the nature of phosphorus it can emit in a variety of colors (hence fluorescent light tubes, which use a phosphorus coating on the inside of the glass to emit light, can be found in "warm" to "neutral" to "cool" color temperatures all based on the source of the phosphorus). And since STPP, TSP, and a host of other phosphorus-laden goodies are standards of the cleaning world, you're more likely than not to find a creepy glow in ANY jug of powder and in a lot of liquids as well. Powdered peroxide fluoresces. So do many salts, dyes, minerals, and binding agents.
So glowing chemical doesn't mean optical brighteners. It doesn't mean dangerous. It doesn't mean toxic or nuclear or carcinogenic. In fact, truth be told, it doesn't mean anything at all except that you can have some fun at parties. "Glowing" minerals and compounds aren't magic, nor are they dangerous. They simply have destabilized electrons in their matrix that "pop off" and run around yelling like fiends when they're excited by energy.
So relax a bit and enjoy your holiday, eh? There's plenty to get worked up about without having to worry about which company puts what in their sauce or how they label it. Carpet cleaning chemistry has been around for a long, long time. It's not going to spontaneously combust over labeling conventions.