Ok, but I do have a question for you
(If you ask my husband, I am the perennial party pooper and kill-joy, plus I notoriously overthink things):
You are looking at 85 pounds of seeds of various sizes you aim to mix into a homogenous feed. not to mention that that is a ton of feed to stockpile for a small flock (I take it you have about 6 hens?)
I buy a 25 pound bag of feed at the store because the 50 pound is too heavy. The bag lasts my 5 girls for a long time. They get a few things extra, but the feed is their staple.
I am not sure you can buy the seeds in just those amounts.
if you have a container with stuff (no matter what, Legos, nuts, cereal...) and move it around, the content will invariably shift to basically separate.
given whole, the birds will with no fail pick through the feed and eat their favorites. After all, they are equipped with natural tweezers.
Out of personal curiosity, how do you propose to mix that amount of feed to get everything evenly distributed? Are you going to buy a cement mixer? Which seems to me to be the most practical solution to amounts like that? (yes, I have dealt with grains in larger amounts. they are dense and heavy, and I was much younger then.)
then again, I am a cynic. I do not believe anything any youtube channel/influencer says. Unless it can be verified by independent sources.
If I were you, I'd look at U_Stormcrow's articles and contributions. He has taken great pains to read up on the recent feed studies. I am not going to tag him here, it's not his job to teach us about nutrition. Although I think he would have not much good to say the recipe you shared)
I wish you the best of luck in your endeavor.