What species if roach are you keeping? I've read dubia (I'm sure most other roaches too) are smart enough to be selective about what they eat vs what nutrients they need. I'm sure they can use that, but I would at least supplement it at a 30/70 ratio with some cheap dry dog food, for protein mostly. Dubia can produce protien from carbs (interesting stuff), but it's not efficient and they'd prefer a straight source of it.

If you want to go cheap though, I feed mine almost exclusively dog food I steal from my parents house and leafy table scraps. I'm not saying it's the best diet, I'm sure there is better, but my little guys do just fine

Edit: just checked the nutritional facts on that page, they have nothing. They're just carbs. No vitamins, no other nutrients. They're not really even cheap, for a staple food you're trying to feed roaches. You'd be better off with those orange slice candies, they're basically the same, but available in the super market for a fraction of the cost, and with both products you'll have to supplement something else in for nutrients anyhow. I'm not saying carbs aren't important for your roaches, but I'm sure there are better sources. Maybe something like this. It has a bit more nutrition, more than double the calories, and costs less