In this context, where the room could be occupied by any person, or group, and the purpose is to prevent infection, then the infection control reasons override everything else, and the the Australian example shows why that is important.
So G4S are undermining the very core purpose of their role by employing people who are breaking the infection control procedures.
The feminist point is why some men are creeps, and will harass women even in circumstances such as this. It goes far beyond safe space, its toxic masculinity in action. A man who harasses a woman, even when any direct contact is a breach of the very reason why he is employed, is unlikely to limiting his harassment to that woman in these circumstances.
G4S should be acting more firmly, and enduring its staff all act properly (not just hide behind how well their policies are written). And
But the root is why some men turn out so toxic, and what sort of socialisation is needed so that boys and young men do not become creeps and worse.