I have experimented a bit and Intervals.icu now considers velocity and cadence when calculating moving time. If velocity is missing or < 0.05 meters/sec then it checks cadence (> 0 is moving). Will deploy Friday AM (GMT+2). Unfortunately you need to reprocess existing files (on the activity list view or Actions → Reprocess file under the ride timeline chart).
“Morning Run” ha ha … looks like all day run to me! With 6051m climbing!!
The interpolated altitude is now the default display for “Altitude” which sorts out the skiing: