Digitec has simply calculated with fewer hours than the manufacturer. You can easily calculate this for yourself.

Estimated operating time in h (per week) × 52 (weeks) × 100 W

If you use 10 hours per week, that would be 52 kWh per year.

Samsung Electronics GmbH
Hello,
Thank you for your enquiry.
The Samsung Odyssey Gaming Monitor G7 (32") LC32G75TQSPXEN has an annual power consumption of 48 kWh. In contrast, the Samsung Odyssey Curved Gaming Monitor G7 (32") LC32G75TQSRXEN has an annual electricity consumption of 58 kWh. Please always note the exact model name of the monitor, which gives you an indication of the annual energy consumption.
You can also read about the models on the Samsung website. Just enter the model name in the search and scroll down to the specifications on the product page.
Best regards from Schwalbach
Your Samsung Service Team