What does this traffic sign combination indicate?

Your answer is correct. This traffic sign combination is a warning sign with an additional panel showing a skier, which means the road may be used by winter sports enthusiasts such as skiers. According to German traffic rules, this sign warns drivers to be cautious because people engaged in winter sports might be crossing or nearby. It is not a prohibition for regular traffic in winter, nor does it require the use of snow chains. The sign aims to increase awareness and vigilance to prevent accidents involving winter sports participants.