However in this day and age if those spaces are going to be protected then unisex spaces need to be created along side single sex.
The described toilets are not unisex toilets.
Unisex has a specific meaning in regard to sanitary facilities.
Ordinary toilets with a bank of cubicles and shared sinks are multi-entry facilities, that is they are used by more than one person entering at a time, but all persons are of the same sex.
A unisex toilet is a single-entry facility, that is a self-contained room complete with toilet and wash basin, with a lockable door that encloses the wash basin. They can only be used by one person entering at a time, but are for the use of individuals of either sex. Unisex stands here for only one of the sexes in the facility at any one time. Disabled toilets for instance are almost always unisex facilities.
The toilets described by the OP meet neither single-sex nor unisex requirements. This is a multi-entry facility that can be used by members of both sexes at the same time, i.e. the sexes mix while using the facility.
Mixed-sex facilities are not what we campaign for in places where we safeguard minors or where the users are especially vulnerable and safeguarding is an issue, such as in hospital wards or prisons.
In all other settings catering to adults, multi-entry mixed-sex facilities would be appropriate as a third space, as long as sufficient numbers of single-sex toilets are also provided.