No the kiosks are closed, you can bring food in but the usual 'no bottles or containers' rule also remains.
On the covid rules debate, not being funny but if you're highly vulnerable it's probably not that wise to be going to an event with hundreds of people in the first place, particularly if you have the option of watching from home. Plus I don't understand why once seated people have to keep their face coverings on in an outside setting of the stadium but in a small enclosed bar or restaurant you can sit 1 meter from another table and happily have your mask off for the duration. Makes no logical sense.