Well we can easily check! It says they used Walmart.

Here's the cheapest per ounce I see for tuna:

https://www.walmart.com/ip/Great-Value-Chunk-Light-Tuna-in-Water-5-oz-4-Pack/33867594?classType=VARIANT&athbdg=L1200&from=/search

It's 3.22 for 400 calories, so one dollar gets you 124 calories of tuna.

Then cheapest wings I see at $3 a pound, and have 4,840 calories for 24 dollars, coming out to 200 calories per dollar:

https://www.walmart.com/ip/Great-Value-All-Natural-Chicken-Wing-Sections-8-lb-Frozen/124310906?classType=REGULAR&from=/search

So for me doing the math JUST off packaging (he appears to use a nutritional calculator) it's coming up chicken wings is cheaper source of calories.

So it's possible in this persons state their chicken was slightly cheaper, and they didn't have the generic tuna. But even in my state where chicken costs a little bit more than what is listed, and my tuna costs a little less, chicken wings are still close to 50% cheaper for calories.

I wonder if it's just a "Feeling" thing, because a little can of tuna is just a dollar! That must be cheap, right?... but a can of tuna is 100 calories, which isn't a great deal.

Idk what their source was but I think you should look for cheapest "possible" to do a fair comparison (cause obviously a certain shop can have super expensive wings). Near me lowest for wings will be 3-5€/kg, canned tuna starts from 8/kg when on discount, but also has like 30% of seed or olive oil in it (so actual tuna cost to the consumer is more like 12€/kg minimum) Chicken is definitely cheaper everywhere IME.

BTW I'm talking raw chicken wings..everything pre-cooked costs more

That depends on where you are what time of year it is. I can get wings on sale for $1.99/lb fairly regular. The only fish I can get that cheap is tilapia.