Wildlife yes, landings mostly no.
Highly pathogenic avian influenza has reached the region and has been associated with serious mortality in South Georgia, including seals and seabirds, with major recent changes recorded in some elephant seal breeding counts. Antarctic penguins have so far not been hit as hard as was initially feared.
For a booked traveller the practical effect is smaller than the headlines suggest. Landing sites have generally not been closed. What has changed is how you behave once you are ashore.
What that looks like in practice: you may be asked to remain standing rather than sitting or kneeling, to keep bags and camera equipment off the ground, and to go through more thorough boot and gear cleaning between sites. A site can be dropped at short notice if conditions there warrant it, but that is the exception rather than the pattern.
None of that is your operator being difficult. Wildlife health and current government guidance outrank the printed itinerary.
One other consequence. It is a reason to distrust undated population claims. Numbers published a few years ago about how many animals are on a particular beach may simply no longer be true, and anybody still quoting them has not checked.
This answer carries a shorter review date than most of our library, because the situation is still moving. If you are travelling soon, ask us what is current for your route.