That’s a mistake. China should not only allow it, but give the condoms free one-way plane tickets, with it in the terms and conditions that they renounce their HK and Chinese citizenship and residency rights now and always.
Seriously, the overwhelming majority of these condoms are the scum of the earth (pedos, incels, sex offenders etc) and/or absolute wasters who just don’t have anything worthwhile to contribute to society and are destined to be benefit sponges and/or a life in petty crime.
For them to F off will be nothing but a massive net benefit for HK and China.