Aren´t most "stars" / artists manufactured in some way?
Not just J Lo
This is referring to singing talent. Take the nineties trilogy of Mariah, Whitney, and Celine. The raw talent is there. They don't need auto tune. There is no question that it's actually them on the recording.
With J Lo, it's not even her voice on the recording. They take another artist vocals and don't credit them for them. Jenny from the block is not her voice, it's the woman in the video below. J Lo is basically a Milli Vanilli and there are many other Milli Vanilli's out there.
Britney has also done this on many songs.
Gotta blame it on something (gotta blame it on something)
Gotta blame it on something
Blame it on the rain that was fallin', fallin'
Blame it on the stars that didn't shine that night
Whatever you do don't put the blame on you
Blame it on the rain, yeah, yeah