This is likely to also impact the GOG release as well. NIS America has also provided a method for people to request refunds for the game, as well.
You can find details on what NIS America wrote on their steam post below:
We regret to inform everyone that the release date for Ys VIII: Lacrimosa of DANA on PC has been pushed back due to continued efforts in improving gameplay quality.
We sincerely apologize to our fans who have been looking forward to this release. Ultimately, our goal is for fans to enjoy a high-quality game. We are providing the extra care in the PC development of the game by taking time to enhance the overall quality of gameplay.
If you have made a pre-purchase on Steam and would like to get a refund, please use the link provided below for instructions on requesting a refund:
For any purchases or pre-orders made outside of the Steam channel, please contact the corresponding refund support for that channel.
A new release date will be announced as soon as it is available.
Thank you for your time, support, and patience with this matter.
The site’s sidebar calendar will be updated to reflect this change.