10 year parent route and partner involvement

The situation is that the immigrant mother and child, who is a British citizen live together. The father is also a British Citizen, The mother has been granted a visa under the 10 year parent route.

The general documentation for the 10 year parent route states that if the applicant shares parental responsibility, the child’s other parent must not be their partner. I assume this means that the child's father cannot be living with the mother and child.

However, the visa was granted under exception circumstances. The conditions in the grant letter include:

1. The ability to study in UK
2. The ability to work in UK
3. The inability to claim public funds.

The other conditions are presumably waived, namely that the applicant must meet certain financial requirements and demonstrate that there will be adequate accommodation.

Do the exceptional circumstance mean that the applicant can live with the father of the child, or does the visa have to be switched to a partner route visa?