Audio file seems kind of bloated.
Average bitrate is 192kbps whilst the cutoff is around 167kbps. This audio could be re-encoded down to 128kbps to reduce filesize.
Spectro: https://op45667.s-ul.eu/LvmOAGcc
New audio: https://op45667.s-ul.eu/C05CA4M9
new spectro: https://op45667.s-ul.eu/S94YwDOx
offset 1948, could move all greenlines back by 4 ms