Widex PRO LINK is a hearing aid programming device and it provides the connection between Widex Compass fitting software on your PC/Computer and your hearing aids.
Remote fitting is a → Cellphone App that can apply changes to your hearing aids from your Audi's version of Compass GPS fitting software. Judging from the linked video in the previous sentence, it appears that a hearing aid programming device is required for remote fitting. Though, you should ask your Audi if a hearing aid programming device is required for remote fitting?
If possible you should avoid Widex PRO LINK and use Noahlink Wireless 2. Why? Because PRO LINK is expensive, and it is proprietary, only for Widex hearing aids. However, you do have the Widex EVOKE models as loaners, and they cannot use Noahlink Wireless! See clip below from the DIY School Legacy Hearing Aids (v2.2) PDF File named (Choose Hardware-Programming Device for Widex);
Legend: NW = Noahlink Wireless/Caution: Noah, NOAHlink & Noahlink Wireless are 3 different things
Legend: PRO= PRO LINK
Legend: USB = USB Link
2020-Q1 MOMENT RIC 10/RB0 = PRO or USB
2020-Q1 MOMENT RIC 312 D/RB2D = NW, or PL or USB
2020-Q1 MOMENT RIC R D/RR2D = NW, or PRO or USB
2020-Q1 MOMENT sRIC R D/RR4D = NW, or PRO or USB
2020-Q1 MOMENT BTE 13/MBB3D = NW, or PRO or USB
2020-Q1 MOMENT BTE/MBR3D = NW, or PRO or USB
2020-Q1 MOMENT ITE 312/M-XP = PRO or USB
2020-Q1 MOMENT ITE 312/M-IM = PRO or USB
2020-Q1 MOMENT ITE 312/M-IP = PRO or USB
2020-Q1 MOMENT CIC MICRO 10/M-CIC-M = ( PRO +Plus wired connector) or USB