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In your 2500 kcals diet you have 3 tbsp of olive oil, which should be 40 grams.
Unfortunately, cronometer is not always clear if the food is raw or cooked. For example, romaine lettuce has not this info.
I changed with red bell peppers cooked but you can eat them raw as well, not much is changing apparently.
You should weigh everything cooked except oats, which are surely uncooked from the listed nutrients. They just about double their weight when cooked. Of course, fruit is raw, and seeds are also raw if not specified.

_what is whole milk? the 2,8% fat version?

green cabbage "fejeskáposzta"? the standard cabbage i guess https://www.spar.hu/onlineshop/fejeskaposzta/p/287014004_

Yes 2.8 % , the cronometer whole milk is about 32% fat but it's not too far from the Hungarian milk.

Yes fejeskáposzta

Before we can consider the diet final, please confirm that it meets your price requirements.
0.5 eggs usually means that one day you eat an egg, the other day no eggs, but cutting the egg in two and eating it every day is the same.
Red pepper is the one in the picture, but it can also be green or yellow, you can choose what's cheaper. I changed the entry to 'red bell pepper'. Red and yellow according to cronometer have huge amounts of vitamin C. Green, a little less (I wonder if the database numerosity of this item is large enough to result in a statistically significant difference).
Milk: maybe when boiled there is some denaturation of protein and other nutrients but cronometer does not make a difference, if you want to avoid that then you can cook oats with water and add milk, milk is always counted anyway as cronometer says.

This is a good daily plan, close to a Mediterranean diet model. Lots of vegetables, some fruit, seeds, beans, little cereals, milk, a modest amount of lean meat, and fish. Just an example, based in part on the available literature, for example, Walter Longo, the longevity diet, Luigi Fontana: the path to longevity, and many other sources.
In your case, probably 2500 kcal is better since you are already very lean and according to much of the literature, your BMI may be too low for optimal longevity.
Also, you should check your body weight daily and enter it into cronometer so you can see the trend. The trend should never go downward, if you lose weight with this diet then it must be changed. As written before, you should probably weigh at least 64 kg, and you should do some exercise to gain lean mass.
You also should go to your doctor and have a periodic blood analysis done every 6 to 12 months.
Chicken is 700 grams per week, good for essential amino acids and niacin, whereas cod is 350 g per week, good for essential amino acids and B12.
Oats should be weighed before cooking; if eaten with milk the availability of their amino acids will increase.
Beans, chicken, and mushrooms, should be weighed after cooking.
Flaxseed must be ground (for example, with a coffee grinder).
Pls check if the total price is within your budget, if not we can decrease the more costly items since all nutrients are way above RDA (and you weigh less than me, so the % is higher in your case)

Yes, kelkapostza appears to be savoy cabbage.

Kale is this one:

The spinach you want to use is 'apritott spenot level', the other is a precooked puree.