Your profiles will also be in:
/Macintosh HD/Users/YOURNAME/Library/Application Support/Adobe/CameraRaw/CameraProfiles
And then in “NegativeLab Camera Profiles” or “Vuescan Profiles” depending on how you’re capturing your negatives.
Ultimately this is how Adobe has designed their software. If you want Nate’s custom profiles to work in Lightroom mobile, you need to follow Nate’s steps above, which are the same as the steps officially provided by Adobe:
As Julieanne states in her blog, you are welcome to remove Lr CC from your computer after the profiles have synced. But if Nate ever updates the profiles in a future version of NLP then you’ll need to download Lr CC again and follow the manual import procedure to get the new profiles synced to the cloud.