It’s a euphemism for a nonsequitor, OP is asking what balloon size has to do with it being okay to shoot it down since there’s nothing about size in protected airspace laws.
Maybe would have been clearer to use a nonseqiotor that doesn't involve China- for a second there I thought that there was something linking these balloons to tea trade or sanctions or something
https://en.wiktionary.org/wiki/price_of_tea_in_China