Hello Bruce
Since IOS 15.1(2)T and later, the ip nhrp nhs command has been expanded to support additional parameters. So to answer your question, yes, you can use the single command in your post to replace the three commands below it.
However, for the purposes of the lesson and to understand each distinct operation more clearly, the three separate commands have been used.
For more information about how the ip nhrp nhs command works, take a look at this Cisco command reference:
I hope this has been helpful!
Laz