I'm gonna say no. This reminds of the last TLOU2 delay. They only delayed it by about a month. Even the first delay was only Feb to May. They're only delaying CP for 2 months. It's not long but it probably gives them enough breathing room for some final polish before launch (obviously they will continue patching the game though after launch).
Witcher 3 was a MASSIVE game (I beat it years ago but I've played it off and on for 5 years - of which there is plenty of content; haven't done this with any other single player game) and had a number of issues, especially at launch. This game is also going to be massive with a shitload of NPCs with their own schedules, lots of quest paths, characters builds, and whatnot on top of the city they've built. So I can definitely see how the extra polish time might be needed.