What is the validity of the claim that the Prophet’s (peace and blessings be upon him) visiting the sick among the disbelievers occurred before the might of Islam, but not after its spread and might?

Question:
He says: Honorable Shaykh, may Allah grant you success. Those who say that the Prophet’s (peace and blessings be upon him) visiting the sick among the disbelievers was before the might of Islam, but not after Islam spread and became mighty, are they not correct? Does this mean the call to Allah has ended?

Answer:
This is not what a scholar says; this is the speech of an ignorant person. It means that after the might of Islam, the call to Allah ended. The call to Allah is continuous, with the sick and with the healthy, it is continuous. He did not say, “Call to the way of your Lord” until Islam becomes mighty. Where did he get this condition from?