Still racial profiling, but maybe not as bad as being stopped for "only" being black.
I think in Finland official taxis say "TAKSI" and have a yellow sign on the roof, so maybe they might suspect any unofficial-looking car with a driver in the front and the sole passenger in the back as being an Uber.
Not really true. However, you do need a taxi license, and many/most Uber drivers didn't have one.
If you're an Uber driver (unlicensed taxi) then things are different. A driver in front (of any colour) and a single adult passenger at the back, starting off from the airport in an Uber-looking car, might get attention.
A licensed Taxi is very unlikely to be stopped by the police in Helsinki, and lots of taxi drivers are black or other immigrant background.
There is something odd in this story, doesn't sound at all typical.