The ruling on one who performs tayammum for major ritual impurity without intention

Question:
Honorable Shaykh, a questioner says: A sick person in the hospital was afflicted with major ritual impurity, but he was unable to perform the full ritual bath. He would perform tayammum when the time for prayer arrived without intending to remove the major ritual impurity, and he remained in that state for a period. Are the prayers he performed valid?

Answer:
If a sick person is unable to use water and is afflicted with major ritual impurity, he performs tayammum due to his illness and inability. He performs tayammum and prays, and praise be to Allah, and his purity is complete. However, if he performed tayammum but did not intend to remove the major ritual impurity.
If he intended to remove the minor ritual impurity, and if he is certain that he did not intend to remove the major ritual impurity, then he must repeat the prayers, because he prayed while in a state of major ritual impurity. This is because purifying oneself from minor ritual impurity does not suffice for purifying oneself from major ritual impurity, unlike the reverse; purifying oneself from major ritual impurity includes purifying oneself from minor ritual impurity. So he must be certain of this and not have doubts. If he performed tayammum and did not intend either major or minor ritual impurity, but rather encompassed both these states of impurity, then praise be to Allah.
As for if he is certain that he did not intend to remove the major ritual impurity in his tayammum, then he must repeat the prayers. Yes.