We're in a similar boat as you. We were also cancelled from the June 2022 Volendam North Cape/Spitsbergen/Iceland cruise. As a replacement, we booked a Viking Ocean cruise from London to North Cape and the Baltic to see this region. We've been loyal with HAL, but with this Volendam cancellation we took the opportunity to try Viking, and it may become a trend for us.
We'd also booked a HAL Spitsbergen/Iceland cruise in May/June 2023. Based on the above posts, I feel that we'll be very disappointed again if Spitsbergen is removed from the itinerary. That would trigger our cancellation because Spitsbergen would be the main purpose for our taking the cruise.
So sad that Princess had to wait until after your final payment/cancellation date to inform you of this major itinerary change. Hardly seems fair...