Since nobody else has quoted it yet, I think this is the most relevant passage in the actual text, from the very end of The Last Battle (abridged slightly):

'There was a real railway accident,' said Aslan softly. 'Your father and mother and all of you are - as you used to call it in the Shadowlands - dead. The term is over: the holidays have begun. The dream is ended: this is the morning.'

 

And as He spoke He no longer looked to them like a lion. [...]

Combined with the passage you already quoted (and given that Lewis was a Christian and unlikely to be referring to anyone other than Jesus with a capitalized He) I don't really see any room for doubt that Aslan was indeed Jesus.

Since nobody else has quoted it yet, I think this is the most relevant passage in the actual text, from the very end of The Last Battle (abridged slightly):

'There was a real railway accident,' said Aslan softly. 'Your father and mother and all of you are - as you used to call it in the Shadowlands - dead. The term is over: the holidays have begun. The dream is ended: this is the morning.'

And as He spoke He no longer looked to them like a lion. [...]

Combined with the passage you already quoted (and given that Lewis was a Christian and unlikely to be referring to anyone other than Jesus with a capitalized He) I don't really see any room for doubt that Aslan was indeed Jesus.