Rapeseed oil has alpha-linolenic acid (ALA) which can be converted into eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), but the process to convert ALA to EPA/DHA is an inefficient one where only about 5-10% of what goes in gets converted. Much of the benefits of omega 3 are found in EPA/DHA and not in ALA, though ALA may also be beneficial.
So, kind of? but not really?
> Also, you make a lot of statements without scientific backup.
This isn't hard to look up nor is it particularly controversial.
> Afaik balanced plant based diet is healthy
It can be. It's just way harder to get the nutrients in the right amounts when compared to someone who is eating meat. Meat obviously has its own issues, but it's undeniable that it's an incredible source of protein that has the right composition of amino acids and has higher bioavailability in the nutrients your body needs. No one is going to accidentally eat a healthy and balanced vegan diet, you will almost certainly become deficient in B12 and potentially a lot of other essential vitamins and minerals. You'll also have issues with amino acids. Meats have a more complete profile that is easily used and absorbed by the body. Individual plant proteins may lack specific ones and the amount and quality of them is lower. Plants also can contain many different antinutrients that make it more difficult for your body to absorb nutrients. This is why plant-based protein powders are a higher quality protein source for vegans than just eating plants.