Doesn't seem likely - that would provide for a one year boost, but the following year the numbers would go right back down again.
What is far more likely:
Like it or not, JWs continue to have success in making converts in poor countries and/or countries where internet access is far less widespread than in North America & Europe. Their message of "your wealthy oppressors are all going to be killed by God soon, and then you will live in their place in paradise, if you just do what we say" is appealing to people who live in rickety hovels with dirt floors with no opportunity to escape poverty.
Those increases in South America & Africa are still (so far) more than offsetting the losses in NA, Europe, and Asia.