What are either of you saying tho?
You can't just use Auto Tune to change the key of someone's vocal
that much (ie a semi tone) Issues and artifacts develop and can be perceived.
In all likelihood, in fact almost assuredly, there is a bit of pitch correction (also known as Auto tune) on her vocals. Pretty much every vocal nowadays has it.
But whether or not there is, is irrelevant. All it accomplishes is bringing the singers voice closer to the intended key. The vocal track can't be remarkably far off to begin with, or the ear will in fact be able to tell that it was corrected heavily.
If they needed the track to be in a new key, she had to lay a new track. That's not what auto tune is for.
Having said that, if they want to perform Troubles in a lower key they don't need to do anything digitally - they can just use one of Li's first vocal takes
Sent from my ass crack