Can I still download the data from my Garmin 910 into any Garmin site.
Can I still download the data from my Garmin 910 into any Garmin site.
According to the specs, yes, you can, but since I do not own the 910XT or any ther device with ony the ANT stick, I cannot tell you how. It should be described in the User Manual though.
can I just add it to my devices on Garmin connect
Yes. I have an old 310XT that syncs with the ANT stick using Garmin Express. As long as you're setup on Garmin Express with the same account as used on Garmin Connect, then you'll see your 910XT.
I found some instructions for the use of GC on the page 30 here: https://static.garmin.com/pumac/Forerunner_910XT_OM_EN.pdf