not even the taylor swift music collective even, since as you pointed out, the math doesn't math for even her, and also as you point out, she very much does not write her own music. she might write a majority of her own lyrics and maybe even a number of her own song skeletons, but production for taylor swift has been phoned in for a bit now. and even if it wasn't that's still people that are being paid to work on it, not her grinding at the studio in between eras tour stops.