How to reconcile the established fact that the Prophet (peace and blessings be upon him) prayed thirteen rak'ahs with the fact that he did not exceed eleven rak'ahs?

The questioner : Shaykh, may Allah bless you, ... the Prophet (peace and blessings be upon him) prayed thirteen rak'ahs; he would pray six, then five, and the first two ... were two light rak'ahs.

The Shaykh : Yes.

The questioner : Shaykh, did he not ... command that ... the prayer be with two light rak'ahs?

The Shaykh : He commanded it and did it.

The questioner : He did this in all forms of witr.

The Shaykh : Whoever wishes to pray tahajjud at night, let him precede it with two light rak'ahs.

The questioner : ... did we not go out of ...?

The Shaykh : Why?

The questioner : It becomes thirteen.

The Shaykh : Yes.

The questioner : And also the two light rak'ahs.

The Shaykh : No, no, thirteen including the two rak'ahs, and in the other hadith it is thirteen including the two rak'ahs of Fajr.

The questioner : Okay, if one prays witr with eleven rak'ahs.

The Shaykh : Yes.

The questioner : Are these two initial rak'ahs counted in it or not?

The Shaykh : No, they are not counted.

The questioner : Then it becomes thirteen ...

The Shaykh : But thirteen: we say that in one instance the two light rak'ahs were counted, and in another instance they were not counted.

The questioner : ... Shaykh ... and five.

The Shaykh : Thirteen, ... of which two are light rak'ahs, and the second wording is explicit that he did not exceed eleven rak'ahs; it is a restriction.

The questioner : So you did not count them?

The Shaykh : You did not count them. In the wording where he restricted it to eleven, he did not count the two rak'ahs, and in the wording where he mentioned thirteen, he counted them, indeed he counted them, yes.
The reader: And it was narrated to me ...

The Shaykh : ... ؟
The student: Yes.

The Shaykh : Ah, yes.