My brother has an IC4. I use it for TR workouts when I visit him. I’m a little perplexed on if the power reading is accurate or not? Trying to find more information on that. But to answer your question, yes it does sync to TR.
I used one for two years, initially with the Peloton app (using Kinetic to display power) and then switched to Trainerroad. After switching, I put Garmin power pedals, and the two power readings were almost identical. The issue I had with the bike that made me switch is that I couldn’t get the fit quite right and was having a lot of knee pain. But I’ve got wonky knees, so it probably isn’t a problem most people have.