welcome to the forum!
unfortunately "glider-chow" is not any different than another brand of pellets. the website that this is sold on is never to be trusted as all of the information they are giving out is incorrect.
a nectar like staple diet is a MUST. one of the cheaper diet options would be LGRS Suggie soup, or Gliderkids. try searching one of these up and see which one is better for you:)
if you choose to feed LGRS then on the side you also offer a protein source (boiled chicken, egg, or turkey) as well as 1 tablespoon fruit and another of veggies. if you feed Gliderkids, then you only need to offer fruits and veggies on the side because the protein is already in the nectar,
I would not feed my gliders any sort of instant mixes (sold on exotic nutrition) because they contain dried raw eggs and dried honey. personally, I would never feed this. if it works best for you, then go for it:)
any more questions? :)