I don't think she covered it well and I disagree with parts of it.
Corn....it is already a primary ingredient in formulated feed. No need to add more AND it is low in protein as well as essential nutrients.
She never once mentions formulated feed like layer pellets or all flock.
Canned fish....often contains added salt. Fed every day can make the eggs taste "off".
The dried worms....yes those are high protein....and VERY expensive.
She never once says how much of what per bird...kind of important to know.
The oyster shell is important BUT 24-7....my birds sleep at night so yeah they aren't eating any then.
As I said in your other thread what you feed your birds is up to you.
Never heard her mention as "treats" and it is titled as getting them to lay more eggs.

I think it a bit confusing to not have mentioned the formulated feed or that she was talking about as treats or other than "a little every morning" referring to the meat only there was no mention of amounts.
Each person should figure out what works for them and run with that.
I didn't watch the whole thing - skipped around a bitLOL
She's o.k. I suppose, but I have a hard time watching a complete video of hers.
Anyway - I agree with with what @21hens-incharge mentioned.
A complete poultry feed should be given as the main source of nutrition to coop/run kept birds.
Oyster shells, that's a given.
Animal protein. Now I am a fan of giving a higher protein than 16% layer feed, but many people have no problems whatsoever. I do use an all flock type feed, but I have roosters, plus a few hens that don't really lay much anymore. You can easily give extra protein a few times a week by giving a small eggs, meat, fish - salt content is a good point so keep that in mind when giving canned fish.
The main thing would be giving a nutritionally balanced poultry feed and making that available during waking hours.
I really don't think you can "make" hens lay more eggs. Each hen is an individual, so she has her own laying cycle.
Something else to think about - being heavy handed with "treats" no matter what is it - from corn to mealworms to meat - could make hens "fat" - this would likely reduce production over time and cause health problems like Fatty Liver Disease.
I agree, some is trial and error.