I deleted the playlist in Garmin Express step 5 : https://www8.garmin.com/manuals/webhelp/GUID-5D183A14-BB43-4A9B-B441-5F824214CE40/EN-US/GUID-CD4439DF-46FF-4279-A8D5-8DA61C87A4EB.html
But the music is still on my watch
I'm on version 10.2 an my watch is up to date.