Garmin never finished the Kayak app / activity, even it being sold as a "premium" frature only available in the more expensive watches.
Kayak app does not count strokes and cadence like SUP and ROW apps do.
My workaround was to use SUP in the watch and later change it to "Paddling" in the Garmin Connect Android app. I had to do this because SUP shows pace (min/km) instead of speed in the graphs page.
Please bring back "Paddling" activity to the sports list, at least until you include proper stroke fields in the Kayak app to make it useful.