You would be amazed at how many people buy chocolate throughout the year...When we were on COVID-19 lockdown and food retails were allowed to open for curbside pickup...Lindt did that too and apparently there were "tussles" breaking out at lineup outside the store waiting to pickup their orders. People WANT their chocolates and they don't want people in their way.
You can also see many Excellence bars are staple goods at Walmart and Loblaws. There are A LOT of people who seem to NEED their Lindt fix. Good for the company...and I guess dentists too.