That is not a dodge. Look at the "one long term increase" and "two long term decrease" and compare the estimated populations. You have 2644 vs 618+900=1518. So, if the rest of the population is "insufficient data" and you only have the above to go off of, the only logical conclusion is that global polar bear population has likely increased.

Now, for the doubling, if you look at the original study I linked, it has a graph of the point estimates through the decades. From the 60s to now is about a doubling. If you throw out the 60s because "it is bad data according to experts" then even the increase is still 50%. These are estimates based on multiple studies in the different time periods whereas the WWF report uses a single report.

I have sufficiently defended my claim and provided actual sources for things other than a news article that says "expert says...". If you want to address any claims or put forth real data, feel free.