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You're exactly right though, that's what he needs to do :]
Look at this link and also this one, you can just

jsr wait_nmi

before each lda / sta pair you do to get up and running, though it's a bit ugly. But hey, it's a start!
Each VBL wait is approx. 1/60 s.

Oh, don't confuse the offsets inside the file (where the song data always starts at byte $80) with the memory layout of the NES. It's possible Deflemask actually does this (have load=$8080), but I don't use it so I'm not sure.
Your data would be located at $8080 if and only if bytes 8 and 9 of the .NSF header are $80.
Also, don't include the first 128 bytes from the .NSF, that's the header. It's metadata and it doesn't belong in the final .NES file.

(Ok, side note here: if the load address is indeed $8080, you could load the entire .nsf file at $8000 and the song data would in fact then be at $8080, because it would be shifted by the size of the header data, so some programs might even do that on purpose, but it's ugly and somewhat confusing! Just read the addresses from the header and then throw the header away. I know, it might take a bit of wrapping your head around all this)

Here's a quick and dirty diagram:

(I've made a test .nsf that is shown there, but the principle is always the same)

Don't worry about $70-$77, just check it's all zeroes (that means no bankswitching). If it's not all zeroes however, you're not gonna be able to use the simple playback method from the nerdtracker example.

Oh, and you can also ask in the nesdev forums, or in the famitracker.org discord (while this discord server is mainly for famitracker users, there are definitely people who know NES programming and might be willing to help, in the #development channel!).

NSF files can (and do!) have different load/init/play addresses. Take a look here: https://wiki.nesdev.com/w/index.php/NSF.
Download a hex editor if you don't have one, it's invaluable for quickly looking inside .NSFs (I use XVI32 personally). Definitely check you're not playing a bankswitched NSF, that's way more complicated that this example you've posted can handle (to the point of requiring custom hardware).

For non-bankswitched NSFs, this should work. If the load address is not $8000, change the

.org $8000

before

.incbin

Also modify the init and play constants and you should be set!
(I dunno why the code defines the load address and then just hardcodes it, oh well)

Good luck! :]
EDIT: Don't forget to strip the header from the .NSF before including it!

Good job, sounds great!

Ok, so I've been listening to this all day. I'm so fkn happy this exists! Easily my favorite release of 2017 so far. Now if you'll excuse me, I need to recommend this to everyone in sight :]

PM'd