Horses can and cant eat.
ALLERGY OR INTOLERANCE?
Here's some articles to study Norcal during your stay on here.

Now what do you think all treats are made out of? Water and grass? Well your wrong, Treats are filled many of things for health and a few unhealthy things, yes but shouldn't cause any issues unless that horse is allergic or sensitive to that ingredient.
Now on the fact of Beer, or any Soda. As Beer sounds crazy to be giving horses beer but it is used as a traditional treatment for
anhidrosis.
A Beer for Our Horse
Now the subject of molasses, it's about half sugar, and the rest is water and minerals.
Horse Sense
As horses has a feed intolerance, quote from "ALLERGY OR INTOLERANCE" "If a horse has a feed intolerance, the culprit is commonly molasses, barley or sometimes alfalfa, but other cereals can be implicated. Feeds that contain cereal by products can also cause a reaction.".
The way your saying this is no animal or human should ever have flour or molasses in their life..? So you, as a human refuse to eat Whole grain breads, crackers, Pasta and breakfast cereals? Yes overfeeding a horse or any animal with flour or anything to your concern can cause problems but that's not the product's maker fault, as you should be watching how much your animal takes in.
"The most common forms of molasses are made from either sugar cane or sugar beet juice which is boiled down to a syrup. Sugar crystals are extracted from the syrup, and the remaining dark liquid is molasses. Molasses can also be made from sorghum, pomegranate, carob, and dates"
Molasses
Blackstrap molasses contains vital vitamins and minerals, such as:
- iron. (Iron is a mineral that the body needs for growth and development.)
- calcium. (calcium serves a huge role in the structural integrity of the skeleton.)
- magnesium. (Functions include helping with muscle and nerve function, regulating blood pressure, and supporting the immune system)
- vitamin B6. (Vitamin B6 is involved in gluconeogenesis and glycogenolysis, immune function Vitamin B6, Vitamin B6 supplementation was shown to significantly alter protein metabolism and increase the ratio of fore + hindleg muscle weight to body weight Vitamin B6 for Horses)
- selenium. (Selenium is a mineral that is essential for the proper functioning of your body. It plays a critical role in metabolism and thyroid function and helps protect your body from damage caused by oxidative stress.)
Also take into thought, HORSES ARE BUILT DIFFERANTLY. Just because your Morgan, Dutch Warmblood or whatever breed can eat these treats doesn't mean every horse can,
Now- Onto the flour.
Flour is a powder made by grinding raw grains, roots, beans, nuts, or seeds. A little bit of flour is okay, it's only in there to act as a binder so that the cookies don't fall apart.
Now dont quote me on Flour, as im not a expert with flour. As Rosa mentioned "Almost every cookie-shaped horse treat has flour in it"
From your lovely person, Who is studying genetics, Equine Study, and Large and Small animal care~