Is the fact that the Messenger shortened the prayer at multiple times and for multiple durations evidence for shortening?

The questioner : Perhaps one of the strongest pieces of evidence I have found is the shortening of the prayer by the Prophet (peace and blessings be upon him) at various times and for various durations. He used to shorten, yes. So, how do you respond to those who hold the second opinion, that the Prophet (peace and blessings be upon him) would wait for the revelation? Yes, that it might come to him on any day. So, as long as he was waiting for the revelation, he did not know when it would be or how long it would last.

The Shaykh : Now, did anyone come and say, "I will walk"?

The questioner : They say that the Messenger (peace and blessings be upon him) did not prostrate except with a revelation.

The Shaykh : It is not correct.

The questioner : Because he was waiting.

The Shaykh : This is a difficult claim, very difficult. I mean, if someone were told now to testify that the Messenger remained only to wait for the revelation, that is not correct. It requires you to testify that the Messenger remained only to wait for the revelation, and then that the revelation granted him a dispensation to travel, meaning that he would walk.

The questioner : The state of the Messenger (peace and blessings be upon him).

The Shaykh : Yes, the revelation is either declaratory revelation, where if Allah confirms it, he knows it is what Allah has legislated, or sometimes it may not be direct revelation, meaning it may be by confirmation.