I don't think its about declaring anything. Actually it might be best to not declare anything at all in order to not shackle yourself unnecessarily.
Of course the PLA at the ground shouldn't and won't target civilians, so after the first days of bombing, the Taiwanese will quickly learn themselves that as long as they don't do anything stupid (e.g hiding troops in their homes) they will be safe.
The PLA will of course officially retain the right to use lethal force at all and any situations but unofficially at the ground they won't target them.
Alternatively, the PLA can from day 1 publicly release its guidelines to the Taiwanese population; under what situations they are not safe and what to avoid in order to not risk possible retaliation.
If a delay of 1 or more days happens, or even no announcement at all, it doesnt matter. Word of mouth can quickly spread so people would soon know how the PLA is treating civilians.
Of course the PLA at the ground shouldn't and won't target civilians, so after the first days of bombing, the Taiwanese will quickly learn themselves that as long as they don't do anything stupid (e.g hiding troops in their homes) they will be safe.
The PLA will of course officially retain the right to use lethal force at all and any situations but unofficially at the ground they won't target them.
Alternatively, the PLA can from day 1 publicly release its guidelines to the Taiwanese population; under what situations they are not safe and what to avoid in order to not risk possible retaliation.
If a delay of 1 or more days happens, or even no announcement at all, it doesnt matter. Word of mouth can quickly spread so people would soon know how the PLA is treating civilians.