Having much calcium among vegetables does not mean having enough calcium as a human food.
Your link uses the silly "cup" unit of measure from which it is hard to assess which is the real calcium content.
The right way to show the content of a nutrient in some food is to show how many kilograms or pounds you must eat daily to provide enough of that nutrient.
In the case of calcium the best case that I have seen for various vegetables is that you would need to eat at least 1 kilogram per day, based on the elemental analysis.
However this is far too optimistic, because when cooking the vegetables a part of the calcium may be lost and another part will be bound in insoluble compounds and it will not be absorbed in the intestine after eating.
So a more realistic estimation is that even for the vegetables with the highest content of calcium you might need to eat at least 2 or 3 kg per day.
For nuts and legumes it is impossible to approach even 1 kg of daily intake, as that would include too much energy in starch or fat.
So only leafy vegetables would avoid gaining weight, but eating kilograms per day would be not only unpleasant, but also harmful.
I happen to be a vegan, so I have studied carefully my alternatives and the best for me is to add some calcium phosphate powder to my food, together with the table salt. I use phosphate and not another calcium salt, because even if all seeds and nuts, including all legumes, have large amounts of phosphorus, most of it is contained in phytic acid, which is harmful, so I use preparation methods that remove much of the phytic acid, but they also remove most of the phosphorus, so I compensate that by adding the calcium as calcium phosphate.