Its a post full of sweeping statements. One can’t be that much sure for the matters which never happened.
Though Sindhi Hindus were cream of the society and there is no doubt that they did contributed a lot and developed areas they lived in, but Sindhi Muslims were not rich (except few families). Their views towards issues like female education were not different than overall Muslim society. Hindus were forward looking, they owned properties, educated their females, but this was not prevalent in Sindhi Muslims.
As they say, there are no free lunches, Sindhi Muslims had to struggle, even if Sindh became part of India. They might have been in same position as are Indian Muslims today (though the situation is not better even Pakistan considering the planted and corrupt politicians).