It's the other way around. The accepted sentences are
Is it correct
Is that correct
"det" could be interpreted as either "it" or "that", but if you want to be clear, you should say "det där" for "that".
"det" could never be interpreted as "this". To say "this" you would have to say "det här/detta".
Ok, here 'det' stands for 'that' (which I find completely fine). In another module we've discussed that 'det är mina halsdukar' cannot stand for 'these are my scarves' and has to be 'they are my scarves' (which sounds wrong, as 'they' is mostly used for persons, not objects). So how do you use this/that/these/those after all? Thanks in advance!