Alright, thank you very much for your detailed answer!
First of all, the 'up-to' seems to be a helpful addition. This also makes it reasonable to me why 3. holds.
For 2. I guess I got it indeed wrong and thought that since we do not use context for interpretation, no knowledge like "Joe Biden" "human" would be given. Now, I see the meta-level difference to the pragmatic level!
For 2. I guess I got it indeed wrong and thought that since we do not use context for interpretation, no knowledge like "Joe Biden" "human" would be given. Now, I see the meta-level difference to the pragmatic level!
Best,
Philipp