Observed polar bear populations are not declining. However, since there is far less ice the polar bear are much easier to find these days, making the counts go up, rather than down. This has been the case in Svalbard, at least.
And there I was thinking Svalbard was only a made up island for the Bear Kingdom in Philip Pullman's His Dark Materials trilogy...
That link does not pass the sniff test at all. Massively slanted an opinionated pieces that look like any5ing but proper science.