As someone did note, the PC version hasn't slipped quite as far as I thought. It's at #22 currently on Steam on the global chart. That isn't actually good, mind you, for a week old game, but it does represent a slow trickle of sales. Still, 20-50k on PC to date is very weak. VC is a relatively high profile series that has earned solid reviews and has a good PC port, and I was expecting something in the range of 100-200k, not somewhere between 20 and 50k. The player peak numbers are pretty soft, too.
https://steamdb.info/app/790820/graphs/
The issue as I see it is that the game is doing poorly everywhere. Japan on PS4 (not sure about Switch version, though which could be important), UK having a very weak launch -- anything below #5 can literally be in the low thousands -- globally on PC, etc.