This is totally incorrect, what do you think you are seeing in the trains? You can easily see each individual satellite. Just after sunset you can see many individual satellites, not just starlink.
They added the sun shields in mid-2020, after several hundred satellites had already been launched. Those remain visible, and make up about 8% of their fleet today.
Kinda makes me wonder what we're going to do about all these satellites in 50-60 years when there's thousands of decommissioned ones floating around.
They deorbit themselves after about 5 years... so if starlink goes tits up, at worst you'll see the satellites for around 5 years. Sooner if they are intentionally deorbited.
Without the shield, you’re right that the satellites would be visible post insertion.